Security
Safety is the primary consideration when switching to urea as a denitrification reducing agent. Liquid ammonia (NH) is a potent denitrification reductant, and although it is highly efficient in some industrial applications, it is inherently highly hazardous. Liquid ammonia needs to be stored and transported in pressure vessels, and once leaked, it can quickly evaporate into gas, causing serious threats to human health, such as respiratory irritation, eye burns and even death. In addition, leakage of liquid ammonia can lead to environmental contamination and equipment corrosion problems.
In contrast,Urea (CO(NH.)As a solid particle or water-soluble liquid, it is relatively safe to carry and store. The urea solution is stable at room temperature, not volatile, and non-toxic, so it greatly reduces the safety risk in operation.
Economic benefits
From an economic point of view, urea is generally less expensive to use than liquid ammonia. Although the raw material costs of urea and liquid ammonia may be similar, the storage, transportation, and handling of liquid ammonia requires special equipment and safety measures, such as pressure vessels and cooling systems, which add additional costs. Urea, on the other hand, has relatively low facility and operating costs due to its good stability and non-harsh storage and transportation conditions.
Ease of use
Ease of use is also an important consideration. Liquid ammonia requires specialized equipment for precise injection and mixing, which is highly complex and requires more stringent operator training. The urea solution can be directly injected into the exhaust system through a simple injection equipment, which is easy to operate, easy to maintain, and easy to achieve automatic control.
Environmental impact
Environmental protection is an important issue in modern society, and urea outperforms liquid ammonia in this regard. The decomposition products of urea are mainly nitrogen and water, which are environmentally friendly; Leakage of liquid ammonia can lead to air and water pollution, posing a threat to ecosystems.
Technology maturity
With the increasingly stringent environmental regulations, urea SCR technology has become a mature and widely accepted NOx emission reduction technology after years of development. Urea SCR systems are highly accepted by automotive manufacturers and industrial facility operators, in part due to their ease of operation, low maintenance costs, and ability to meet stringent environmental standards.
Although liquid ammonia still has its application value in some specific fields, in the long run, urea has obvious advantages as a denitrification reducing agent, which not only provides a safer, economical and environmentally friendly solution, but also meets the current global trend of environmental protection and sustainable development. As a result, urea will continue to dominate future exhaust gas treatment systems, especially in the areas of heavy-duty vehicle and industrial emission control. With the advancement of technology and the improvement of environmental requirements, we expect more innovations and improvements to further improve the efficiency and reliability of urea SCR systems and meet the global demand for emission reduction.
Keywords: denitrification reducing agent, liquid ammonia to urea.
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