Overview
Denitrification reducing agents are critical for mitigating nitrogen oxide (NOx) emissions, a major air pollutant regulated globally. These chemicals react with NOx in flue gases to form harmless nitrogen and water, typically via SCR (Selective Catalytic Reduction) or SNCR (Selective Non-Catalytic Reduction) technologies. Ammonia (NH3) and urea (CH4N2O) are the most common agents, chosen for their reactivity and cost-effectiveness. The choice between them depends on system design, temperature ranges, and operational constraints. Industrial adoption has surged due to tightening environmental standards like China's Ultra-Low Emissions policy and the EU's Industrial Emissions Directive.
Physical and Chemical Properties
Aqueous ammonia (25–30% NH3) is a colorless liquid with a pungent odor, while urea appears as odorless white crystals. Both exhibit high water solubility, facilitating precise dosing in emission control systems. Key reaction pathways include NH3 + NOx → N2 + H2O (SCR) and urea’s thermal decomposition into NH3 for SNCR. The agents must maintain stability at high temperatures (300–400°C for SCR, 900–1100°C for SNCR). Corrosivity is a concern, requiring stainless-steel storage and handling equipment to prevent degradation.
Main Applications
These reducing agents are indispensable in coal-fired power plants, where SCR systems achieve up to 90% NOx removal. Cement and steel industries also rely on them to comply with emission limits, often using SNCR for its lower capital costs. Emerging applications include marine engine exhaust treatment and biomass combustion. In China, the market is driven by retrofits in thermal power stations, while Europe emphasizes waste-to-energy plants. Hybrid systems combining SCR and SNCR are gaining traction for their operational flexibility.
Safety and Storage
Ammonia-based agents require rigorous safety protocols due to their toxicity and flammability. Storage tanks must include leak detection and emergency ventilation, with secondary containment for spills. Urea, while safer, demands dry conditions to prevent caking. Transportation follows ADR/RID regulations for hazardous materials. On-site handling mandates PPE (respirators for NH3) and spill kits with neutralizing agents (e.g., citric acid). Compatibility checks are vital—ammonia reacts violently with halogens or mercury.
B2B Procurement Guide
Buyers should assess suppliers’ ability to provide consistent purity (e.g., ≥99.5% urea) and traceability documentation. Bulk purchases (railcar or ISO tank deliveries) often reduce costs by 15–20% compared to drum shipments. Key procurement criteria include: (1) compliance with GB/T 2440-2017 (urea) or HG/T 5354-2018 (ammonia water); (2) on-time delivery guarantees to avoid production disruptions; (3) value-added services like dosing system maintenance. Tender evaluations should weight environmental certifications (e.g., ISO 14001) at 20–30%.
Related Manufacturers
- 主营：速溶硅酸钠、氯化钾、融雪剂、脱硝剂、生化黄腐酸钾、小麦淀粉、过磷酸钙、糖蜜粉、山梨糖醇液、糖蜜、木质素磺酸钙、果葡糖浆、麦芽糖浆、EM菌粉、氯化钙、葡萄糖、红糖、麦芽糊精、腐殖酸钠、过硫酸氢钾、高效减水剂、硫酸钾、矿源黄腐酸钾、防冻液、防冻粉
- 主营：船用尿素
- 主营：脱硝剂、低温脱硝剂、高分子脱硝剂、液体脱硝剂、黄烟去除剂
- 主营：絮凝剂、废水处理、混凝沉淀剂、高效脱硝溶液、烟气脱硝溶液、工业烟气脱硝溶液、通用型脱硝溶液、液态脱硝还原剂、脱硝净化溶液、专用脱硝溶液、聚合氯化铝、净水混凝剂、油污净化水处、处理净水药剂、泳池景观水净化、水处理用助凝剂、高纯度液碱、工业液碱、32液碱、50液碱、电镀工业液碱、32%离子膜液碱、浓缩液碱、矿山选矿液碱、阴离子聚丙烯酰胺
- 主营：蒸汽发生器、尿素水解器、尿素热解炉、脱硝反应器、脱硝模块、氨水蒸发器、计量分配模块、喷氨格栅、尿素溶解罐
- 主营：液碱、氢氧化钠、漂水、次氯酸钠、片碱、聚合氯化铝、聚丙烯酰胺、烧碱、工业葡萄糖、污水处理剂
- 主营：浓密机、搅拌机、发酵皮、搅拌装置
- 主营：高温脱硝剂、低温脱硝剂、脱硝剂、高分子脱硝剂、液体脱硝剂、固体脱硝剂、黄烟去除剂
- 主营：脱硝剂、低温脱硝剂、高温脱硝剂、高分子脱硝剂、黄烟去除剂、烟气处理剂
- 主营：苯并三氮唑、苯甲酸、消泡剂、催化剂、聚酯树脂、分离柠檬酸、石油工业、片碱造纸、白油工业、三乙醇胺、纯碱工业、一水柠檬酸、固体润滑剂、正磷酸化工、润滑添加剂、磷肥专用磷酸、乙二醇甘醇、片碱水处理、纯碱碳酸钠、表面活性剂、无水硫酸铜、防冻剂溶剂、碳酸钠工业、水处理氨基、工业专用片碱
- 主营：脱硫设备、脱硫塔、布袋除尘器、脱硝设备、scr脱硝设备、pncr脱硝设备、sncr脱硝设备、脱硫脱硝设备、脱硫脱硝除尘设备、滤筒除尘器、湿式静电除尘器
- 主营：双功能催化剂、分子筛催化剂、分子筛、分子筛活化粉、分子筛脱水剂、负载金属催化剂、金属脱氧剂、介孔材料、钯系催化剂、ZSM-5分子筛、Y型分子筛、多级孔分子筛、介孔分子筛、聚氨酯除水剂、加氢催化剂、分子筛吸附剂、异构化催化剂、环化反应催化剂、甲基化催化剂、吡啶合成催化剂
- 主营：矿源黄腐酸钾、腐植酸钠、氨基酸原粉、液体脱硝剂、大苏打、木质素磺酸钠、工业红糖、有机酸碧水安、工业葡萄糖、工业白糖、木质素磺酸钙、海藻精、过硫酸氢钾、枯草芽孢杆菌、高铁酸钾、黄腐酸钾、软水盐、鱼蛋白、大蒜油、水玻璃、腐殖酸钾、腐殖酸钠、离子钙、胺鲜酯、养殖红糖
- 主营：云母粉、蛭石粉、膨润土、硅藻土、电气石、云母片、麦饭石、石英砂、重晶石、sio2焊条、发热铁砂、耐火漂珠、煅烧沸石、防火涂料、膨胀蛭石、空心漂珠、涂料彩砂、生蛭石片、白色蛭石、实木木粉、染色彩砂、火山熔岩、晶体电介质、滤料鹅卵石、生物质燃料
- 主营：脱销喷枪、脱硫喷枪、雾化喷枪、还原剂喷洒喷枪、氨水喷枪、尿素喷枪、烟气降温喷枪、高压回流喷枪、螺旋喷嘴、涡流喷嘴、雾化喷头、实心锥喷头、雾化喷嘴、扇形喷嘴、饱和器喷头
- 主营：火花捕捉器、无焰泄爆装置、阻火器、烟气脱硝设备、不锈钢脱硫塔、单向隔爆阀、脱硫塔、泄爆片、火花报警器、锁气卸灰阀、火焰报警器、催化燃烧设备、火花捕集器、滤筒除尘器、泄爆口
- 主营：om-5防腐涂料、8710饮用水涂料、有机硅高温漆、丙烯酸聚氨酯漆、水性丙烯酸面漆、环氧陶瓷涂料、聚氯乙烯含氟荧丹漆、环氧玻璃鳞片涂料、乙烯基玻璃鳞片涂料、环氧自流平面漆、无溶剂环氧涂料、氟碳漆、耐油导静电涂料
- 主营：脱硝催化剂、稀土脱硝催化剂、高温脱硝催化剂、SCR脱硝催化剂、中温脱硝催化剂、烟气脱硝催化剂、低温脱硝催化剂、脱硝催化剂厂家、蜂窝式脱硝催化剂