30+ Brine Chillers and Direct Cooling Systems for Wanhua Chemical: 8 Years of Industrial Refrigeration Across MDI, TDI, PC, PMMA, and Specialty Chemical Production Lines

Between 2016 and 2023, Lmart delivered over 30 industrial refrigeration units to Wanhua Chemical Group — brine chillers, direct cooling systems, and condensing units spanning cooling capacities from 130 kW to 2,400 kW and covering nearly every major production line in Wanhua’s chemical complex. Refrigerants include R134A, R22, R507/R507A, and R717 (ammonia), with ethylene glycol brine circuits serving the majority of installations.

Customer	Wanhua Chemical Group Co., Ltd. (万华化学集团股份有限公司)
Industry	Petrochemicals & specialty chemicals — Fortune Global 500
Project Locations	Yantai, Shandong (primary); multiple Wanhua production bases
Equipment	Brine chillers, direct cooling systems, condensing units (30+ units total)
Cooling Capacity Range	130 kW to 2,400 kW per unit
Refrigerants	R134A, R22, R507, R507A, R717 (ammonia)
Coolant	Ethylene glycol (brine systems); direct expansion for direct cooling units
Design Institutes	Wuhuan Engineering, Hualu Engineering & Technology, Huanqiu (Daqing), Jilin Petrochemical Engineering Design, Changchun Institute of Applied Chemistry
Delivery Period	2016–2023 (8 consecutive years)

Customer Background: Wanhua Chemical Group

Wanhua Chemical Group is China’s largest MDI (methylene diphenyl diisocyanate) producer and one of the world’s top polyurethane raw material manufacturers. Headquartered in Yantai, Shandong Province, Wanhua is a Fortune Global 500 chemical conglomerate with operations spanning isocyanates (MDI, TDI, HDI), polycarbonate (PC), PMMA acrylics, specialty chemicals, and advanced materials. The company’s Yantai industrial park alone contains dozens of interconnected production plants, each with distinct refrigeration requirements driven by process chemistry, operating temperatures, and regulatory constraints.

Industrial refrigeration is critical infrastructure across virtually every Wanhua production line. Polymerization reactors require precise temperature control to manage exothermic reactions. Distillation columns need sub-zero condensation stages. Storage tanks for volatile intermediates like ethylene and vinyl chloride demand continuous vapor cooling to maintain safe operating pressures. The diversity of Wanhua’s chemical processes — from isocyanate synthesis to acrylic polymerization to ammonia production — translates directly into a corresponding diversity of refrigeration system requirements: different refrigerants, different evaporating temperatures, different capacity scales, and different safety classifications.

Scope of Supply: 8 Years, 15+ Plants, 30+ Units

The following table summarizes all Lmart deliveries to Wanhua Chemical from 2016 through 2023. The breadth of this supply record — across plant types, refrigerants, cooling capacities, and design institutes — reflects an established vendor relationship built on repeated qualification and consistent performance.

Year	Plant / Application	Equipment Type	Capacity (kW)	Motor Power	Refrigerant	Coolant	Units	Design Institute
2016	PMMA	Brine chiller	980	280 kW	R134A	Ethylene glycol	3	Wuhuan Engineering
2017	PC (Polycarbonate)	Brine chiller	900	250 kW	R134A	Ethylene glycol	1	Wuhuan Engineering
2018	HDI (Isocyanate)	Direct cooling	925	500 kW	R22	—	3	Hualu Engineering & Technology
2020	VC (Vinyl Chloride)	Brine chiller	1,579	650 kW	R507	Ethylene glycol	1	Wuhuan Engineering
2020	PMMA	Brine chiller	910	315 kW	R134a	Ethylene glycol	1	Wuhuan Engineering
2020	HCL	Brine chiller	1,040 / 680	280 / 1,000 kW	R22	Ethylene glycol	2	Hualu Engineering & Technology
2021	TDI (Isocyanate)	Brine chiller	2,400	900 kW	R507	Ethylene glycol	3	Hualu Engineering & Technology
2021	MDI — Ethylene Tank	Direct cooling	1,300	1,400 kW	R507	—	1	Hualu Engineering & Technology
2021	LDPE/EVA	Brine chiller	1,022	280 kW	R507	Ethylene glycol	2	Huanqiu (Daqing)
2021	PC (Polycarbonate)	Brine chiller	2,114	1,250 kW	R507A	Ethylene glycol	1	Hualu
2021	Rectisol — Ammonia	Condensing unit	1,700	1,500 kW	R717 (ammonia)	—	2	Huanqiu (Daqing)
2022	MQ Silicone Resin	Brine chiller	277	160 kW	R507	Ethylene glycol	2	—
2022	XDI (Isocyanate)	Brine chiller	1,828 / 86	1,250 / 22 kW	R507A	Ethylene glycol	3	Hualu Engineering & Technology
2022	BPA (Bisphenol A)	Brine chiller	1,560	400 kW	R134A	Ethylene glycol	2	Jilin Petrochemical Engineering Design
2022	R&D Center	Refrigeration system	2,150	1,250 kW	R507A	Ethylene glycol	2	Changchun Institute of Applied Chemistry
2022	Ammonia Plant	Refrigeration system	130	110 kW	R507A	Ethylene glycol	1	Hualu Engineering & Technology
2023	Direct Cooling	Direct cooling	1,700	1,250 kW	R507A	—	1	Hualu Engineering & Technology

Engineering Challenges in Large-Scale Chemical Refrigeration

Multi-Refrigerant Design Capability

Wanhua’s production lines employ four distinct refrigerant families, each imposing different engineering constraints on compressor selection, heat exchanger design, materials compatibility, and safety systems:

• R134A (HFC, non-flammable, GWP 1,430) — used in PMMA and BPA plants where moderate evaporating temperatures (−5 °C to −15 °C) are required and explosion-proof classification is not mandated. R134A systems use standard copper-brazed or stainless plate heat exchangers with no special ventilation requirements.
• R22 (HCFC, ODP 0.055) — specified for HDI and HCL plants where existing infrastructure was designed around R22 operating pressures. These are legacy installations where refrigerant commonality with existing plant equipment outweighed the transition to newer alternatives. R22 systems require careful attention to discharge temperatures and oil return in high-compression-ratio applications.
• R507/R507A (HFC azeotrope, non-flammable, GWP 3,985) — the workhorse refrigerant for Wanhua’s medium-to-low-temperature applications (−25 °C to −45 °C). R507A’s near-azeotropic behavior provides stable evaporating and condensing temperatures with no glide, simplifying control system design. It dominates the newer installations: TDI, MDI, LDPE/EVA, PC, XDI, and the R&D center.
• R717 (ammonia, natural refrigerant, GWP 0) — used in the Rectisol ammonia condensing application where the 1,700 kW capacity and −33 °C evaporating temperature favor ammonia’s superior thermodynamic efficiency. Ammonia systems require full compliance with GB 50058 hazardous area classification, dedicated machinery rooms, and ammonia detection/alarm systems.

Designing, manufacturing, and testing refrigeration packages across this refrigerant spectrum requires parallel competencies in compressor matching, heat exchanger sizing, piping material selection (carbon steel for ammonia, copper for HFC, steel for HCFC), and safety system integration. Each refrigerant brings distinct operating pressures, discharge temperatures, oil miscibility characteristics, and regulatory requirements.

Capacity Range: From 130 kW Lab Systems to 2,400 kW Plant Chillers

The Wanhua supply scope spans a 1:18 capacity ratio — from a compact 130 kW ammonia plant refrigeration system to the 2,400 kW TDI brine chillers that are among the largest single-compressor units in Lmart’s product range. This range demands fundamentally different engineering approaches:

• Small systems (130–300 kW) are typically single-compressor, single-circuit packages with limited turndown, designed for continuous duty at near-constant load. The 277 kW MQ silicone resin chillers and the 130 kW ammonia plant unit fall into this category.
• Medium systems (900–1,600 kW) frequently employ dual compressors or multi-stage configurations to provide capacity modulation and redundancy. The PMMA, PC, VC, and BPA chillers use this arrangement.
• Large systems (1,700–2,400 kW) require careful attention to compressor motor starting current, foundation loading, vibration isolation, and brine piping hydraulics. The 2,400 kW TDI chillers deliver cooling at evaporating temperatures around −35 °C with R507, driving compression ratios above 8:1 and demanding two-stage or economized screw compressor configurations.

Direct Cooling vs. Brine Chiller Systems

Wanhua’s refrigeration installations include both brine (indirect) systems and direct cooling (direct expansion) systems, each suited to different process conditions:

• Brine chillers circulate ethylene glycol solution through shell-and-tube or plate heat exchangers in the process area. The refrigeration package is located remotely in a machinery room, with only the brine loop entering the process zone. This separation is essential in hazardous areas (MDI, TDI, VC plants) where refrigerant leakage into the process area could create ignition risks or contaminate product streams.
• Direct cooling systems evaporate refrigerant directly in process-side heat exchangers, eliminating the brine loop and its associated temperature approach penalty (typically 3–5 °C). The HDI direct cooling units (925 kW, R22) and the MDI ethylene tank direct cooling system (1,300 kW, R507) use this approach where process temperatures are low enough that the efficiency gain from eliminating the brine loop justifies the additional safety engineering of placing refrigerant equipment in or near the process area.

Why Wanhua Chemical Continues to Select Lmart

Multi-refrigerant platform capability. Wanhua’s procurement teams work with five different design institutes across dozens of plant expansions. Each institute specifies the refrigerant and system architecture based on process requirements and site classification. Lmart’s ability to deliver R134A, R22, R507/R507A, and R717 systems from a single manufacturing base — with consistent quality documentation and commissioning support — simplifies Wanhua’s vendor qualification and reduces procurement overhead compared to sourcing from multiple specialized suppliers.

Proven track record across 15+ production lines. Each new Wanhua order benefits from the institutional knowledge accumulated across previous deliveries. Lmart’s engineering files contain compressor selection data, heat exchanger configurations, and brine system parameters for PMMA, PC, HDI, VC, TDI, MDI, LDPE/EVA, HCL, MQ, XDI, BPA, and ammonia production — enabling faster engineering response times and reduced design risk on repeat or similar applications.

Design institute relationships. Lmart has executed Wanhua projects specified by Wuhuan Engineering, Hualu Engineering & Technology, Huanqiu, Jilin Petrochemical Engineering Design, and the Changchun Institute of Applied Chemistry. Each design institute has its own documentation standards, P&ID conventions, and review processes. Lmart’s familiarity with these institutes’ requirements reduces engineering clarification cycles and minimizes design review iterations.

Scale consistency. Delivering 30+ units over 8 years — averaging nearly 4 units per year — requires manufacturing consistency that is difficult to achieve with project-by-project sourcing. Wanhua benefits from stable production quality, familiar commissioning procedures, and spare parts commonality across its installed base of Lmart refrigeration equipment.

Engineering and Manufacturing Highlights

Compressor Selection and Matching

Refrigeration compressor selection for chemical process applications differs fundamentally from commercial HVAC. Process loads are defined by reaction kinetics, not weather — the 2,400 kW TDI chillers must deliver rated capacity at −35 °C evaporating temperature regardless of ambient conditions, with minimal capacity variation over 8,000+ annual operating hours. Lmart’s engineering team selects compressors based on the specific operating point — evaporating temperature, condensing temperature, suction superheat, and oil cooling requirements — rather than catalog nominal ratings that assume standard AHRI conditions.

For the larger R507/R507A units (1,800–2,400 kW), economized screw compressors with variable volume ratio (Vi) provide the compression ratio flexibility needed for seasonal condensing temperature variation while maintaining efficiency at the design evaporating temperature. The Vi adjustment matches the compressor’s built-in volume ratio to the actual system pressure ratio, avoiding the over-compression or under-compression losses that degrade COP in fixed-ratio machines operating away from design conditions.

Shell-and-Tube Heat Exchanger Design for Brine Service

Brine-side heat exchangers must address the specific challenges of ethylene glycol service: higher viscosity than water (especially at low temperatures), reduced heat transfer coefficients, and the potential for glycol degradation if local wall temperatures are excessive. Lmart’s evaporator designs for Wanhua use flooded shell-and-tube configurations with enhanced tube surfaces on the refrigerant side to compensate for the glycol-side heat transfer penalty. Tube material selection (copper, copper-nickel, or stainless steel) is matched to the glycol concentration and the presence of any process-side contaminants that could enter the brine loop through heat exchanger leakage.

Ammonia System Engineering (R717)

The 2021 Rectisol ammonia condensing units (1,700 kW × 2) represent a distinct engineering category within the Wanhua supply scope. Ammonia systems require:

• All-steel construction — no copper or copper alloys in any wetted component
• Welded steel piping throughout, with flanged connections limited to equipment interfaces
• Machinery room design per GB 50058 with ammonia detection, emergency ventilation, and water spray systems
• High-pressure receiver and oil separation systems designed for ammonia’s immiscibility with mineral oil at low temperatures
• Relief valve sizing accounting for ammonia’s toxicity classification (ASHRAE B2L) and discharge to a safe location

The thermodynamic advantage of ammonia at the −33 °C evaporating temperature required for Rectisol gas purification is significant: COP approximately 15–20% higher than R507A at the same operating conditions, translating to meaningful energy savings over the 8,000+ hour annual operating schedule of a Rectisol unit.

Quality Assurance and Project Execution

Each Wanhua delivery follows a standardized QA protocol adapted to the specific design institute’s requirements:

• Design review and P&ID verification with the specifying design institute before manufacturing release
• Compressor performance verification at the compressor manufacturer’s test facility (witnessed by Wanhua/design institute for large units)
• Pressure vessel components (evaporators, condensers, receivers) fabricated and tested per GB/T 150, with material certificates, NDE reports, and hydrostatic test records
• Complete package assembly with piping, instrumentation, control panel, and wiring at Lmart’s workshop
• Factory performance test: refrigerant charge, leak test, compressor run-in, control sequence verification, and capacity measurement where test conditions permit
• Documentation package per design institute specification: equipment drawings, P&ID, instrument lists, motor data sheets, spare parts lists, operating manuals, and quality records
• On-site commissioning support and performance verification during plant startup

The 8-year supply history provides a practical quality metric: Wanhua’s repeated procurement from Lmart across multiple design institutes and plant types indicates that field performance has met expectations consistently enough to justify continued vendor qualification without competitive re-tendering on each project.

Results and Strategic Significance

The Wanhua Chemical account represents Lmart’s largest sustained domestic refrigeration relationship. Over 30 units delivered across 8 years, covering 15+ distinct production applications with 4 refrigerant types, establish a supply record that few domestic refrigeration packagers can match in either breadth or duration.

For Wanhua, the operational benefit is supply chain efficiency: a single qualified vendor capable of delivering refrigeration systems for any new plant or expansion project, regardless of the refrigerant, capacity, or design institute involved. For Lmart, the Wanhua track record serves as a qualification reference for other major chemical producers evaluating industrial refrigeration suppliers — the combination of Fortune Global 500 customer status, multi-year continuity, and technical diversity across refrigerants and applications provides credibility that single-project references cannot.

Customer Voice

Wanhua Chemical’s procurement pattern speaks directly to vendor confidence: over 8 years, new projects across different production divisions and different design institutes have continued to specify Lmart refrigeration equipment. This is not a single procurement decision but a sustained series of independent selections by different project teams within the same organization.

“When multiple design institutes across different Wanhua divisions independently approve the same vendor, it reflects consistent field performance rather than procurement inertia.”

— Industry observation (paraphrased)

Note: Lmart respects client confidentiality. Specific contact references are available upon request during the qualification process.