Shandong Laiwu 50,000 m³/d Integrated Water Treatment Plant Energy-Saving Pump Retrofit ｜ Laiwu · Shandong

Application scenario: Shandong Steel Laiwu Energy & Power Plant, 50,000 m³/day industrial wastewater deep treatment and reuse project, covering blast furnace slag wastewater, hot rolling scale wastewater, coking wastewater, domestic sewage, and RO concentrate, with reuse for furnace cooling, hot rolling laminar cooling, and sintering. Northern Shandong winter -18℃ / summer 39℃, high dust in metallurgical environment, multi-water-quality conditions (slurry with iron oxide and slag abrasion, coking wastewater with high TDS chloride corrosion, clean reuse water with high hardness scaling). Steelmaking and rolling operations have intermittent flow fluctuations over 40%, requiring 24h continuous operation with low fault tolerance. Original S-type pumps had low efficiency, valve throttling caused over 26% energy loss, impellers wore and scaled within 3–4 months, pump shells froze in winter, constant-speed operation lacked intelligent control, maintenance required over 8h shutdown, annual spare parts cost exceeded one million RMB.


Solution content: M&W ENERGY SAVING complete four-pump systems: XS split-type double-suction pumps (XS600-680 / 500-700, 3800–4600m³/h / 26–32m / ≥87.2%, 10kV VFD linked to level control), LC vertical long-shaft slurry pumps (LC450-240, 2600m³/h / 24m, 2507 duplex stainless steel, anti-sediment flushing), DG multistage booster pumps (DG200-45×6, 140–260m³/h / 260–330m, 316L wetted parts for RO high pressure), IH corrosion-resistant pumps (316L full wetted parts for coking wastewater acid/alkali transport). ZG20Mn low-temperature alloy pump body ensures no brittle fracture at -18℃, 304/316L/2507 graded corrosion resistance, all stainless fasteners, silicon carbide mechanical seal, 220V electric tracing. CFD impeller efficiency improves by 10–14 percentage points, quick maintenance reduces time by 70%, integrated into Shandong Steel environmental smart platform.


Project results: comprehensive energy saving rate 24%–29%, annual electricity savings over 1.5 million RMB; overhaul cycle extended from 3–4 months to over 12 months, maintenance cost reduced by 68%; wastewater reuse rate stabilized above 90%, reducing groundwater extraction. Benchmark industrial water treatment system in central Shandong, replicable to similar facilities in Rizhao, Shiheng, Jigang, and Rizhao Steel.

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