In industrial production, the selection of materials has a crucial impact on many aspects such as production efficiency, product quality, and equipment lifespan. In the specific field of urea production, titanium alloy has gradually become an indispensable key material due to its unique performance advantages, bringing significant changes and improvements to urea production.
The strict requirements for materials in the urea production environment
In the process of urea production, the reaction of converting ammonium carbamate into urea is not completely carried out, and a mixture containing urea, excess ammonia, and water will be formed. The intermediate product ammonium carbamate solution exhibits extremely strong corrosiveness under high temperature and high pressure conditions. This harsh working condition places extremely high demands on production equipment and materials. Ordinary materials are difficult to withstand such harsh corrosive environments and are prone to damage, which in turn affects the continuity and stability of production and increases production costs. Therefore, finding an ideal material that can adapt to this special environment has become an urgent problem to be solved in the urea production industry.
Unique advantages of titanium alloy in urea production
The reason why titanium alloys have emerged in the field of urea production is mainly due to their excellent corrosion resistance.For the sake of example, although the stainless steel performance is superior in resisting high temp urea corrosion, its resistance to urea corrosion is declined significantly as the temperature rises. The corrosion rate of stainless steel is doubled for every 10 ℃ rise in temperature. And titanium alloy, however, is still able to keep its chemical stability under high temperature, resisting effectively against medium erosion like ammonium carbamate solution, which brings about a great extension on service life of equipment.
In addition, the use of titanium alloys has brought many conveniences to the urea production process. Under high temperature and high pressure conditions, the use of titanium alloy equipment does not require blowing oxygen like other material equipment. This feature not only simplifies the production operation process and reduces operational difficulty, but also significantly improves the synthesis rate of urea. At the same time, due to the better adaptability of titanium alloy equipment to harsh working conditions, large-scale equipment has become possible, further improving production scale and efficiency, and producing higher quality urea products.
The wide application of titanium alloy in urea production equipment
Application Practice in the United States
The American crucible company believes through research that titanium equipment can improve the process efficiency of urea, because titanium equipment can operate stably at high temperatures. Based on this understanding, titanium tube heat exchangers and titanium pipes are widely used in factories producing urea. These titanium equipment effectively solve the corrosion problem of equipment in high-temperature environments, ensuring smooth production and improving the stability and reliability of the entire urea production system.
Innovative Applications in Japan
In the 1960s, Mitsui Toho Chemical Company in Japan innovatively applied titanium as a lining material to urea production equipment. After conducting extensive experiments and gaining a deep understanding of the corrosion resistance of titanium, the company adopted titanium in its urea synthesis tower and various associated equipment. This measure has achieved significant results. Under high temperature and high pressure conditions, the use of titanium lined equipment eliminates the need to blow oxygen into the urea equipment in the high process. This not only improves the synthesis rate, but also makes the operation of the equipment easier, resulting in a significant improvement in the quality of the products produced. At the same time, the equipment has also been scaled up. The successful experience of Mitsui Toho Chemical Company in Japan has led to the widespread adoption of this application method worldwide.
Targeted applications in Italy
In the urea synthesis process, the stripping tower developed by the Italian National Methane Pipeline Transport Company faces more severe corrosion challenges. In the stripping tower, urea needs to be separated from the reaction products of the production process, and amines are used, which further exacerbates corrosion. In order to address this issue, the company has adopted titanium on the stripping tower, effectively solving the corrosion problem, ensuring the normal operation of the stripping tower, and improving the separation efficiency and product quality of urea production.
China's Exploration and Development
In the early 1970s, China also made significant breakthroughs in the manufacturing of urea production equipment. China has designed and manufactured a 240000 ton CO2 stripping tower for urea, which uses explosive composite titanium steel plates for its head, straight tube, and upper and lower tube plates, and contains 1361 31mm X 31mm titanium tubes. The equipment was put into production in 1979 and retired in 1987. It has been in operation for 1310 days and has undergone 31440 hours of chemical production. The operation is basically good, which fully proves the reliability and durability of titanium alloy in urea production equipment. In 1990, China designed and manufactured a 400mm titanium lined synthesis tower and put it into operation in Anyang. at the same conditions, the rate of corrosion for titanium is an order of magnitude less than that of 316L stainless steel and it can be applied at a even higher temperature, and this brings significant economical benefits in the areas of electricity, steam, and water conservation, and this will further open up the application and development of titanium alloys in the field of urea production in China.
Conclusion
In Summary, Because of the good corrosion resistance and good stability in the high temperature and high pressure environment, so titanium alloys have been extensively applied to the urea production field.From the United States, Japan, Italy to China, the practice of using titanium alloys in urea production equipment has achieved significant results, not only improving the production efficiency and quality of urea, reducing production costs, but also promoting the continuous progress of urea production technology. With the continuous development of technology and the further improvement of material performance requirements, the application prospects of titanium alloys in urea production and other industrial fields will be even broader.
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