Nanjing Heat Exchanger Chemical Cleaning Services

Abstract: Nanjing, a key Yangtze River Delta industrial city, hosts the Jiangbei New Materials Science and Technology Park, Nanjing Chemical Industrial Park and Jiangning Economic and Technological Development Zone. Heat exchangers there typically lose 20%–40% of heat transfer efficiency after 6–12 months due to hard Yangtze River water. This article covers chemical cleaning solutions for shell-and-tube, plate and spiral-plate heat exchangers — circulation, soak and combined processes — plus service coverage, case data and response times across all Nanjing districts.

1. Overview of Nanjing Industrial Heat Exchanger Cleaning Demands

1. Overview of Nanjing Industrial Heat Exchanger Cleaning Demands

As a key industrial city in the Yangtze River Delta, Nanjing hosts multiple large industrial clusters including the Jiangbei New Materials Science and Technology Park, Nanjing Chemical Industrial Park, and Jiangning Economic and Technological Development Zone — with dense concentrations of chemical, power, steel, and pharmaceutical industries maintaining an enormous installed base of heat exchangers. The Yangtze River water in the Nanjing section has relatively high hardness, with pronounced scaling tendencies in circulating cooling water systems. Heat exchangers typically experience 20%–40% heat transfer efficiency decline after 6–12 months of operation, making regular chemical cleaning an essential maintenance measure for ensuring efficient production unit operation.

Danyang Blue Star Cleaning is located in Danyang, Zhenjiang — only 80 km from downtown Nanjing, approximately a 1-hour drive — enabling rapid response to heat exchanger cleaning needs across all of Nanjing. The company is a member of the China Industrial Cleaning Association with 25 years of industry experience, having cumulatively served over 100 enterprises in Nanjing and surrounding areas.

2. Common Heat Exchanger Issues in Nanjing

Affected by the Yangtze River water quality, heat exchanger scaling in Nanjing is predominantly CaCO₃ water scale, with some chemical installations experiencing accompanying silicate scale and iron oxide deposits. Common issues include: shell-and-tube heat exchanger tube bundle internal and external wall scaling causing heat transfer efficiency decline, plate heat exchanger inter-plate flow channel blockage causing increased pressure differential, and spiral-plate heat exchanger weld zone stress corrosion. Differentiated chemical cleaning solutions must be developed based on scale types and equipment types.

With Nanjing's hot and humid summers and cold winters, heat exchanger cleaning windows typically concentrate during the March–May and October–November annual maintenance seasons. Blue Star Cleaning supports year-round emergency response, including holidays.

3. Heat Exchanger Chemical Cleaning Technical Solutions

The following cleaning solutions are adopted for mainstream heat exchanger types in Nanjing:

Shell-and-Tube Heat Exchangers: HCl-series or LX-903 (sulfamic-acid-series compound cleaner) circulation cleaning, combined with dedicated corrosion inhibitors and surfactant penetrants. For stainless steel tube bundles, LX-903 systems are preferred to avoid Cl⁻ stress corrosion cracking risks. Alkali neutralization and nitrite-series passivation are performed after cleaning.

Plate Heat Exchangers: After disassembly, LX-900 series (organic-acid compound cleaner) soak cleaning is employed, combined with molybdate-series corrosion inhibition protection. LX-900 series offers high safety for stainless steel plate surfaces and can complex iron oxides; simple water flushing after cleaning is sufficient without additional neutralization steps.

Spiral-Plate Heat Exchangers: LX-903 (sulfamic-acid-series compound cleaner) + LX-900 series (organic-acid compound cleaner) composite formulation circulation cleaning is used, with a dedicated copper corrosion inhibitor, focusing on protecting spiral body weld zones. Cleaning flow velocity is controlled at 0.5–1.0 m/s to ensure uniform scale stripping within flow channels.

4. Nanjing Service Coverage and Response Times

Coverage includes all administrative districts of Nanjing — Gulou, Xuanwu, Qinhuai, Jianye, Qixia, Yuhuatai, Jiangning, Pukou, Luhe, Lishui, and Gaochun Districts. Key industrial parks such as Jiangbei New Materials Science and Technology Park and Nanjing Chemical Industrial Park operate under a 2-hour rapid response mechanism: upon receiving a service call, engineers arrive on-site the same day for inspection and issue a cleaning plan. Routine heat exchanger cleaning projects are completed within 2–5 working days; large installations within 10 working days.

5. Nanjing Service Case Study

Case: Shell-and-Tube Heat Exchanger Cleaning for a Nanjing Chemical Enterprise

Equipment parameters: Carbon steel shell-and-tube heat exchanger, heat exchange area 180 m², tube-side medium circulating cooling water, shell-side medium organic solvent vapor. After 14 months of operation, outlet temperature deviated 18°C from the design value, with tube bundle inner wall scale thickness of 2–4 mm.

Cleaning solution: HCl-series cleaning agent + dedicated corrosion inhibitor + surfactant formulation, circulation cleaning temperature 55–65°C, cleaning duration 5 hours. Pre-cleaning coupon test corrosion rate: 1.5 g/(m²·h), inhibition efficiency 96.2%, exceeding national standards. Post-cleaning heat exchange efficiency recovered to 94% of design value, steam consumption reduced by 17%, yielding annual energy cost savings of approximately ¥210,000.

6. Why Choose Blue Star Cleaning

25 years of deep industry experience with cumulative completion of over 500 heat exchanger cleaning projects; Member of the China Industrial Cleaning Association with cleaning processes conforming to GB/T 25146-2010 standards; 2-hour response across Nanjing with on-site arrival within 24 hours; Transparent cleaning agent formulations with complete cleaning reports and coupon corrosion data provided; Waste liquids neutralized per environmental standards for compliant discharge.

6. Nanjing Heat Exchanger Cleaning FAQ

Q1: How fast can you respond to heat exchanger cleaning in Nanjing?

2-hour response across Nanjing with on-site arrival within 24 hours, covering all districts including Jiangning, Lishui, Gaochun, Luhe and Pukou; chemical park enterprises get priority scheduling.

Q2: How much heat transfer efficiency can be recovered after cleaning?

With proper cleaning, the heat transfer coefficient recovers to above 95% of design value and operating energy consumption drops markedly. We have completed over 500 heat exchanger cleaning projects and provide before/after data comparison.

Q3: How do I choose between online no-shutdown cleaning and shutdown deep cleaning?

Continuous-production plants choose online no-shutdown cleaning (using the circulation loop, production keeps running); during shutdown maintenance, deep cleaning is chosen and can be combined with high-pressure water jetting for more thorough descaling.

Q4: How is the waste cleaning solution handled?

Waste liquids are collected, neutralized and discharged per environmental standards, strictly following GB/T 25146-2010 acceptance criteria, with a complete cleaning report and coupon corrosion data provided.

Related: Heat Exchanger Cleaning · Free Scale Diagnosis Tool · Maintenance Cycle Calculator

The cleaning processes and acceptance criteria described here follow GB/T 25146-2010 Industrial Equipment Chemical Cleaning Quality Acceptance Standard.

Service Coverage: Jiangsu (Nanjing, Suzhou, Wuxi, Changzhou, Zhenjiang, Yangzhou) · Zhejiang (Hangzhou, Ningbo) · Shanghai · Anhui (Hefei) · Shandong · Henan

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