Overview
Urea denitrification, or urea-SCR (Selective Catalytic Reduction), is a widely adopted technology for reducing nitrogen oxide (NOx) emissions in industrial and power generation settings. It is particularly effective in low-temperature winter conditions where traditional ammonia-based SCR systems may face operational challenges. The process involves injecting urea solution into exhaust streams, where it decomposes into ammonia and reacts with NOx over a catalyst to form harmless nitrogen and water. This method is favored for its safety, as urea is easier to handle and store than anhydrous ammonia. It is commonly used in coal-fired power plants, cement factories, and diesel engine exhaust systems. The adaptability of urea-SCR to varying temperatures makes it a reliable solution for winter operations.
Physical and Chemical Properties
Urea (CH4N2O) is a white, crystalline solid with a molecular weight of 60.06 g/mol. It has a high solubility in water, making it ideal for preparing aqueous solutions used in SCR systems. Urea decomposes at temperatures above 132°C, releasing ammonia (NH3), which is the active reducing agent in the SCR process. The density of urea is approximately 1.32 g/cm³, and it is stable under normal storage conditions. However, it can absorb moisture from the air, leading to caking, which is why proper storage in dry conditions is essential. Urea is non-toxic and non-flammable, but dust inhalation should be avoided to prevent respiratory irritation.
Main Applications
Urea denitrification is primarily used in industries with significant NOx emissions, such as power generation, manufacturing, and transportation. In coal-fired power plants, urea-SCR systems are integrated into flue gas treatment processes to meet stringent environmental regulations. Industrial boilers and cement kilns also employ this technology to reduce their environmental footprint. In the automotive sector, urea-SCR is used in diesel engines to comply with Euro 6 and EPA Tier 4 emission standards. The AdBlue solution, a 32.5% urea-water mixture, is injected into the exhaust system to facilitate NOx reduction. The versatility of urea-SCR makes it suitable for both stationary and mobile applications.
Safety and Storage
Urea is generally safe to handle, but precautions should be taken to avoid prolonged exposure to dust or solutions. Personal protective equipment (PPE) such as gloves and goggles is recommended during handling. Storage areas should be dry and well-ventilated to prevent moisture absorption and caking. Urea solutions used in SCR systems should be kept in corrosion-resistant tanks to prevent degradation. Freezing can be an issue in winter, so heating elements or insulated storage may be necessary. Regular inspections of storage facilities and handling equipment are advised to ensure system integrity and safety.
B2B Procurement Guide
When procuring urea for denitrification, buyers should prioritize high-purity urea (≥99.5%) to ensure efficient SCR performance. Suppliers should provide certificates of analysis (CoA) to verify product quality. Bulk pricing is typically more economical, with reference ranges around $300-$600 per metric ton, depending on market conditions. It is also important to evaluate supplier reliability and logistics capabilities, especially for winter deliveries where low temperatures can affect transportation. Buyers should consider local storage solutions and consult with SCR system manufacturers to ensure compatibility with their specific operational requirements.
Related Manufacturers
- 主营：喷枪头、喷淋除尘、雾化喷头、脱硝喷嘴、燃烧脱硝、尿素喷枪、脱硫脱硝、加湿喷嘴、雾化喷枪、除尘喷枪、喷雾喷头、除尘设备、脱销喷嘴、喷枪定制、脱销喷枪、氨水喷枪、喷淋喷雾、冷却除尘、高压喷头、脱硫喷枪、喷淋喷嘴、涡轮喷枪、降温喷嘴、降温喷头、脱硫喷嘴
- 主营：分析试剂、水处理清洗剂、净化水产养殖
- 主营：元明粉、防冻液、洗涤剂、尿素、消泡剂、离子钙、三乙醇胺、碳酸氢钠、一水柠檬酸、鱼塘增氧片、酸度调节剂、硫代硫酸钠、表面活性剂、二甲基甲酰胺、十二烷基苯磺酸、大石桥四硼酸钠
- 主营：食品级液碱、食品级片碱、氢氧化钾、尿素价格、双氧水、工业酒精、槽车运输、工业硫酸、食品级盐酸、工业级盐酸、聚合氯化铝、一水柠檬酸、食品级酒精、铁桶装、乙酸乙酯、工业级硼砂、液碱、32%液体氢氧化钠、醋酸乙酯、液体氢氧化钠、工业级液碱、食品级氢氧化钠、甲醇、固体氢氧化钠、氢氧化钠片碱、氢氧化钠
- 主营：乙二醇、氯化铵、氯化钾、尿素、氯化钙、过硫酸铵、消泡剂、亚硝酸钠、十二烷基苯磺酸钠、AES、磺酸、甲酸、氢氧化钾、异丙醇、苯酚、二甲苯、乙酸乙酯、二甲基甲酰胺、甲醇、乙醇、聚合硫酸铁、聚合氯化铝、二乙二醇
- 主营：船用尿素
- 主营：印染洗剂、三乙醇胺、污水处理剂、尿素、净水质大苏、表面活性剂、二甲基甲酰胺、无水亚硫酸钠、二乙二醇丁醚
- 主营：氨水、液碱、次氯酸钠、尿素厂家、二甲苯、酒精、三氯乙烯、二氯甲烷、二甲基甲酰胺dmf、乙二醇丁醚、甲缩醛、正丁醇、无水乙醇、精甲醇、6#120#溶剂油、碳酸二甲酯、95.无水乙醇、醋酸钠、片碱、乙二醇单丁醚、防冻液、醋酸乙酯、石油醚、氯化亚砜、甲醇、硫酸铵
- 主营：石墨烯、甘油、片碱、钛白粉、USP级甘油、聚合氯化铝、软水盐、小苏打、乙二醇、融雪剂、甲缩醛、液碱、氨水、草酸、DMF
- 主营：氧化钙、碳酸钙、高岭土、工业尿素、硅藻土、膨润土、硫酸钡、重晶石、三聚氰胺、氢氧化钙、工业盐、石英砂、碳酸氢钠、小苏打、轻质碳酸钙、融雪剂、海泡石、磁粉、铁粉、矿渣粉、纳米碳酸钙、活性钙、脱硫增效剂
- 主营：氢氧化钠、次氯酸钠、小苏打、尿素颗粒、纯碱、聚合氯化铝、除磷剂、葡萄糖、柠檬酸、工业盐、融雪剂、聚丙烯酰胺、磷酸三钠、硼砂、液碱、食品片碱、粒碱、碳酸氢铵、高效除磷剂、聚合硫酸铁、工业除磷剂、工业级国标除磷剂、工业级聚合硫酸铁、污水处理除磷剂、净水絮凝剂、絮凝沉淀脱色剂
- 主营：邻苯二甲酸二辛酯、环氧大豆油、乙二醇、尿素、二乙二醇、丙二醇、丙三醇、三乙醇胺、二甲基亚砜、甲基吡咯烷酮、聚乙二醇、无水柠檬酸、桐油、氯化石蜡、乙醇、酒精、乙酸乙酯、溶剂油、冰醋酸、防冻液、甲醇、dop
- 主营：过硫酸铵、过硫酸钠、过硫酸钾、尿素、沉淀硫酸钡、草酸、片碱、大苏打、氯化钾、纯碱、滑石粉、氯化镁、硫酸镁、聚合氯化铝、硫酸亚铁、硫化钡、氯化钡、聚丙烯酰胺、碳酸钡、硼酸、硼砂、氯化钙、工业盐、磷酸二氢铵、碳酸钙
- 主营：工业尿素、片碱、硅藻土、氢氧化钾
- 主营：水玻璃、工业级甲醛、次氯酸钠、尿素、氨水、二氯甲烷、磷酸、冰醋酸、二甲基甲酰胺、甲酸、苯酚、片碱、液碱、多聚甲醛、硫酸铜、铬酸酐、过碳酸钠、蒸馏水、软水盐、草酸、漂白粉、速溶硅酸钠、碳酸二甲酯、三氯乙烯、EDTA二钠、大苏打