A kind of production device of synthetic urea solution

Abstract

The invention discloses a system for synthesizing a urea solution. The system comprises a carbon dioxide storage tank, a carbon dioxide droplet separator, a carbon dioxide five-section compressor, an oil removal and desulfurization trough, a medium-pressure carbon dioxide heater, a dehydrogenation reactor, a medium-pressure carbon dioxide cooler, a gas-liquid separator, a high-pressure condenser, a liquid ammonia filter, a liquid ammonia buffer tank, a high-pressure ammonia pump, a high-pressure injector, a urea synthesis tower, an overflow pipe, a high-pressure washer, and a high-pressure washer circulating water cooler. The power consumption of the production device is reduced, and the heat of ammonium carbamate separated at high temperature and high pressure is effectively used in the process of being condensed, so that the total energy consumption is reduced; the system is large in operating flexibility, high in running rate, small in explosion hazards, and convenient to install and maintain; process condensed liquid can be reutilized, so that no pollution is caused; in the process of synthesizing the urea solution, the conversion rates of carbon dioxide and ammonia are high, and remaining unreacted carbon dioxide and ammonia can be cyclically and fully utilized, so that the utilization rate of raw materials is close to 100%.

Description

technical field [0001] The invention relates to a device system for synthesizing urea solution, which belongs to the field of chemical industry. Background technique [0002] Urea is a basic chemical product. my country is a large agricultural country and uses a huge amount of urea. The production capacity of urea is related to national agricultural and food safety. At present, the production processes adopted by large and medium-sized urea plants include: aqueous solution full circulation method, medium pressure combined urea method, carbon dioxide stripping method, and ammonia gas stripping method. [0003] Aqueous solution full circulation method: This method is adopted by most small and medium-sized urea plants in my country. The production process is mature, the operation is convenient and reliable, and the pumps and non-standard equipment are all domestically produced. It is characterized by a high conversion rate in the synthesis tower. Unreacted substances are decomp...

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Problems solved by technology

[0004] Carbon dioxide stripping method: Since the 1970s, my country has successively introduced more than a dozen sets of carbon dioxide stripping urea production units, most of which are large-scale units, which are characterized by short process flow, low synthesis pressure and low power consumption, but harsh operating conditions and corrosion It is more serious, the exhaust gas has the risk of explosion, and the operation flexibility is small

[0006] It can be seen that the above-mentioned mainstream urea production process and its devices have obvious shortcomings and limitations

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