Ammonia Exhaust — Ternary Precursor Production
15,000 + 10,000 Nm³/h; inlet 500 mg/m³; outlet <10 mg/m³.
Collection ducting → two-stage acid scrubbing → fan → stack.
Hydrogen Chloride Gas Recovery & Scrubbing
8,000 Nm³/h; inlet approx. 500 mg/m³; outlet <10 mg/m³.
Stage-1 water scrubbing (recovery) → stage-2 alkali scrubbing → fan → stack.
HCl & NOx from Refining
10,000 Nm³/h; NO ≈ 5,000 ppm, NO₂ ≈ 3,000 ppm; outlet NOx <130 mg/m³.
Oxidation tower → reduction tower → fan → stack.
HCl Mist from PAC Production
40,000 Nm³/h at ~110 °C; inlet 400 mg/m³; outlet <10 mg/m³.
Concentration tower (recovery) → water scrubbing → fan → alkali scrubbing → stack.
Sulfuric Acid Mist — Battery-Grade Copper Foil
Copper-dissolving section 32,000 Nm³/h; inlet 400 mg/m³; outlet <10 mg/m³.
Water scrubbing → alkali scrubbing → fan → stack.
Ammonia & Acid Gas, Two-Phase Project
Phase 1 tail gas 42,000 Nm³/h from feather hydrolysis and amino-acid production; phase 2 ammonia/acid gas from leucine & glutamine refining.
One scrubbing system per phase with circulation-liquor recovery — eliminating major raw-material losses.
Corn Steeping & Starch Drying Exhaust
35,000 Nm³/h with traces of SO₂ and starch dust; outlet SO₂ <80 mg/m³, odour <2,000 (dimensionless).
Water scrubbing → alkali scrubbing → fan → stack.
Odour Control — 100,000 t/day Plant
Nine biofiltration deodorization systems; treated odour emissions meet national requirements.
Collection ducting → biotrickling filters (pre-spray + bio-oxidation) → fan → stack.
Wastewater-Station Odour — Gelatin Plant
8,000 Nm³/h; inlet H₂S 80 mg/m³, ammonia 50 mg/m³; reverse-membrane sealing with FRP duct collection.
Water scrubbing → biotrickling filter → mesh demister → fan → stack; emissions meet Zhejiang provincial requirements.
HF, SO₂ & Organic Exhaust
20,000 Nm³/h total; pre-scrubbed ahead of downstream organic removal.
Three-stage alkali scrubbing → activated-carbon tower → fan → chimney.
Chlorine-Bearing Dusty Exhaust
20,000 Nm³/h; outlet chlorine <10 mg/m³, dust <10 mg/m³.
Swirl-plate tower → water scrubbing → two-stage alkali scrubbing → fan → stack.
Acid Mist — Automotive Parts Plating
Mainly HCl at approx. 80 mg/m³; full 50,000 Nm³/h acid-mist scrubbing system; outlet HCl <1 mg/m³.
Alkali scrubbing tower (high-efficiency mesh) → fan → stack.
Waste Incineration & Solid-Waste Projects
In solid-waste, sludge and hazardous-waste incineration lines, the main induced-draft fan keeps the whole process under negative-pressure control — VFD-driven and interlocked with the kiln-hood pressure gauge; high-pressure, heat-resistant and silencer-equipped. Dingyu also manufactures high-temperature, corrosion-resistant deacidification (quench) towers for the tail-gas cooling and purification train.
Selected project references — from 117 named customers in the company profile: SMIC (Shanghai), Tianma Microelectronics (Shanghai / Xiamen), Samsung Semiconductor (Xi'an), SK hynix (Wuxi), LG Electronics (Guangzhou), BOE (Chengdu / Chongqing), AU Optronics (Xiamen), Hengtong Optic-Electric, ZTT Precision Materials, Hong Kong Sha Tin Sewage Treatment Works, Jiangsu Xinqu No. 2 Wastewater Plant, Nanjing Jiangning Chengbei Wastewater Plant, Juhua Group, Nanjing Red Sun, Shandong Sun Paper, Baowu Steel Group, Masteel Group, Zijin Mining Group, Daiko Machinery (Japan), Hankook Tire (Jiaxing) — across electronics, photovoltaics, chemicals, pharmaceuticals, wastewater, machinery, paper, petrochemicals, steel and metallurgy.