Energy saving process and system for ammonia synthesis and urea preparation
An energy-saving system and a technology for synthesizing ammonia, which are applied to the energy-saving process of synthesizing urea from ammonia and the system field thereof, can solve the problems of increased device consumption, large cost and consumption, wasteful loss of liquid pressure, etc. The effect of reducing the difference
Active Publication Date: 2013-09-25
WUHUAN ENG
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Problems solved by technology
[0004] The cooled crude ammonia from the ammonia synthesis tower has almost the same pressure level as the synthesis process, which is 11-14 MPaG. The crude ammonia generally needs to undergo high-pressure separation and medium-pressure separation to produce liquid ammonia products. After liquid ammonia is separated by high pressure 11 During the process from ~14 MPaG to medium pressure separation of 2~5 MPaG, pressure reducing valves and orifice plates are generally used to decompress directly, and the liquid pressure can be lost in vain, and the product liquid ammonia needs to be sent to urea synthesis. The pressure is increased to 15-18MPaG, which repeatedly increases the consumption of the device. In particular, the high-pressure ammonia pump under this condition generally needs to be imported, and the cost and consumption are very large. Both the operating consumption and product cost of the synthetic ammonia urea system have important practical significance
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[0030]Below in conjunction with accompanying drawing, system of the present invention and technical process are further explained:
[0031] The system of the present invention includes a synthetic ammonia circuit 11 and a urea plant 12, and also includes a pressure exchanger, which includes a high-pressure end control valve group 8, upper and lower pressure exchanger cylinders 3, 4, and a low-pressure end check valve group 9. The crude ammonia pipeline of the synthetic ammonia loop 11 is connected to one end of the upper pressure exchanger cylinder 3 and the lower pressure exchanger cylinder 4 respectively through the high-pressure ammonia separator 1 and the high-pressure end control valve group 8; the upper pressure One end of the exchanger cylinder 3 and the lower pressure exchanger cylinder 4 is also connected to the liquid ammonia heater 6.1 in the refrigeration circuit 6 through the high-pressure end control valve group 8, the medium-pressure ammonia flash tank 2, and the...
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The invention relates to an energy saving process and a system for ammonia synthesis and urea preparation, and solves the problem of high consumption of high pressure energy in the prior art for the ammonia synthesis and urea preparation. Through use of the energy saving process and system, liquid ammonia pressure energy after synthesis ammonia high-pressure separation can be sufficiently utilized, so that the high pressure energy of liquid ammonia before decompression can be sufficiently utilized, and the organic combination between the ammonia synthesis and urea technological process can be realized. The liquid ammonia and liquid ammonia products obtained both by separation have basically same quantity of flow, so that the fluctuation of fluids being pressurized can be avoided, and through regular control of valve groups at both ends of pressure exchanger cylinder bodies, stable and continuous pressurization can be realized. The energy saving process and the system have the advantages of simple process, high utilization rate of the high pressure energy, connectivity operation, low investment cost and operation cost, and high reliability of equipment installation and operation.
Description
technical field [0001] The invention relates to a process and system for synthesizing ammonia to urea, in particular to an energy-saving process and system for synthesizing ammonia to urea. Background technique [0002] In recent years, with the sharp increase in energy prices such as coal and electricity, the production cost of synthetic ammonia urea, a high-energy-consuming industry, has increased significantly. The increase in electricity prices requires the entire nitrogen fertilizer industry to further optimize the process in design and establish a feasible Energy-saving measures to reduce energy consumption are of great significance for optimizing the production capacity of the entire nitrogen fertilizer industry. [0003] At present, the advanced ammonia synthesis technology in the industry adopts the medium and low pressure ammonia synthesis process, and the refrigeration cycle adopts a closed cycle loop. The liquid ammonia product produced by ammonia synthesis is se...
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Inventor张占一夏炎华肖晓愚徐建民夏吴张洪伟范琳彭琳
OwnerWUHUAN ENG