At the appraisal meeting, the appraisal committee listened to the work reports, technical reports, new reports and assessment reports of Sichuan Meifeng and China Five Rings, reviewed the relevant technical qualifications, and conducted on-site defenses and discussions.
Photo of scientific and technological achievements appraisal meeting with participants
On November 28, 2017, the highly efficient, low-energy urea process passed the identification of scientific and technological achievements organized by the China Petroleum and Chemical Industry Federation in Beijing. The appraisal expert group unanimously held that the overall technology of the process has reached the international advanced level, in which the medium-pressure steam consumption of tons of urea is about 700 kg, and it occupies the most advanced technology level in foreign countries. This technology was jointly developed by China Wuhuan Engineering Co., Ltd. and Sichuan Meifeng Chemical Industry Co., Ltd. and has been used in the annual output of 150,000 tons of urea plant in Sichuan Meifeng.
The results of the 72-hour on-site assessment organized by the Petrochemical Federation show that the liquid ammonia consumption per ton of urea product was 568.27 kg, the CO2 consumption was 739.50 kg, and the steam (2.4 MPaG, saturation) of the main unit consumed 785.50 kg (the steam consumption was 695.50 kg compared to the same time in the case of hydrolysis and desorption). ), The main unit circulating water consumption 53.9 tons (by 10 degrees temperature difference), low-pressure saturated steam by-product 127.76 kilograms (0.59MPaG), CO2 conversion rate of 62.77%.
Sichuan Meifeng Technology to produce 150,000 tons of ammonia plant
The appraisal opinion shows that the main innovation of the technology is the development of a new combination of high-efficiency CO2 steam pressure synthesis and medium-pressure decomposition recovery to achieve energy cascade utilization; Tower volume improves CO2 conversion. The key equipment of the high-pressure circle of the technical device is simple and reliable in structure and low in technical risk; the process condensate is recycled after treatment and no waste water is discharged.
According to Xia Yanhua, deputy chief engineer of Wuhuan, the project is a set of domestically produced urea process technology developed on the basis of efficient condensing, low installation height CO2 stripping urea production process and high pressure tubular full condensing reactor invention patent. Technology package and engineering design package; has formed industrially efficient high-performance synthetic, low-energy urea process technology, featuring low energy consumption, low investment, and high level of localization.
This technological achievement technology urea process device
Xia Yanhua said that the basic principles of different urea process technologies at home and abroad are the same, and advanced technologies and others are mainly reflected in the level of comprehensive energy consumption. The fully-condensed reactor they developed integrates ammonium formate condensation and urea reaction. It combines the functions of a condenser and a reactor. It can achieve a higher synthesis conversion rate under milder operating conditions and a higher by-product pressure at the same time. Steam, reduce energy consumption. In addition, the full condensing reactor can effectively divert the load of the urea synthesis tower and reduce the volume of the urea synthesis tower, which is beneficial to the large-scale development of the urea plant. The reactor has been operating on the Sichuan Meifeng urea plant for more than three years and has withstood the test of various operating conditions and multiple open and stop operation operations.
According to reports, the project technology not only has significant economic benefits in the transformation of the existing traditional aqueous solution full cycle urea plant and the traditional CO2 stripping urea plant. When it is used to build a urea plant of the same scale, the investment is at least 20% less than the introduction of foreign technologies. Above, the operating costs are also lower.
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