Urea synthesis device and urea synthesis method

Abstract

The invention relates to the field of urea production, and particularly relates to a urea synthesis device and a urea synthesis method. The urea synthesis device comprises a horizontal condenser and a horizontal reactor, wherein the inlet of the horizontal condenser receives liquid ammonia and an ammonium carbonate solution from a high-pressure ammonia pump and a high-pressure ammonium carbamate pump and ternary-substance series mixed gas of NH3, CO2 and water from a stripping tower, the liquid ammonia, the ammonium carbonate solution, the ternary-substance series ternary system mixed gas of NH3, the CO2 and the water enter the horizontal condenser for condensation and generate chemical reaction, and NH3 and CO2 react to generate ammonium carbamate; the horizontal reactor is connected with the horizontal condenser and used for dehydrating ammonium carbamate to generate urea; the stripping tower is connected with the horizontal reactor and a CO2 compressor and is used for heating, decomposing and stripping a mixed urea solution from the horizontal reactor so that the ammonium carbamate is decomposed into the NH3 and the CO2 and free NH3 and CO2 and water are stripped out. The urea synthesis device provided by the invention enhances the urea synthesis transformation ratio and reduces the energy consumed for conveying material, the construction investment and the urea production cost by adopting the horizontal reactor and the horizontal condenser.

Description

technical field [0001] The invention relates to the field of urea production, in particular to a urea synthesis device and a synthesis method. Background technique [0002] Urea synthesis technology has been successfully developed as early as the beginning of the 20th century. There are many ways to synthesize urea, mainly including urea aqueous solution circulation method, oil solution circulation method, steam stripping method, and UTI (thermal synthesis) process in the United States. Among them, the steam stripping method is the urea production process commonly used in the world at present. The stripping method is mainly divided into carbon dioxide stripping (Netherlands), ammonia stripping (Italy), double stripping process (Italy) and ACES (Japan). In the prior art, the synthesis device using the steam stripping method generally adopts a vertical + multi-layer tray internals urea synthesis tower, because the vertical + multi-layer tray internals urea synthesis tower ha...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a urea synthesis device and synthesis method to overcome the defects of low synthesis conversion rate, high material transportation energy consumption, large investment and inconvenient operation and maintenance of the urea synthesis device in the prior art

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