Urea production process of high-efficiency condensation, low-mounting height CO2 air stripping method and high-voltage lamp type full condensation reactor

A technology of installation height and production process, applied in the field of high-pressure tubular full-condensing reactors, can solve problems such as difficulty in rational utilization, low steam pressure, and short residence time, and achieve the effects of saving investment, convenient operation, and easy maintenance and repair.

CN101492398AActive Publication Date: 2009-07-29WUHUAN ENG
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2009-07-29

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Abstract

The invention discloses a CO2-stripping process for urea with efficient condensation and low installation height and a high pressure tube condensation reactor. Problems of a traditional urea process are solved, including high civil construction framework, high device investment and hard operation, management and maintenance. With the specific high pressure tube condenser adopted, gas and liquid are separated, unreacted gas in the high pressure tube condensation reactor is directly sent to a scrubber, and simultaneously reacted liquid is sent to a synthesizing tower by a high pressure ejector. Compared with the traditional urea civil construction framework, the height of the framework of the process is lowered by 20-25m. The process has the advantages of simple modification, energy-saving property, lowered energy consumption, lowered investment, convenient operation and convenient maintenance and overhauling.
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Description

technical field

[0001] The invention relates to an industrial urea production process and its special equipment, in particular to a high-efficiency condensation, low installation height CO 2 Gas stripping urea production process and high-pressure tubular full condensation reactor. Background technique

[0002] Industrial urea production is based on CO 2 Gas and liquid ammonia are used as raw materials, which are processed into solid urea products through high-pressure synthesis, medium-pressure or / and low-pressure decomposition and recovery, vacuum concentration, and granulation.

[0003] At present, the production processes of urea plants at home and abroad mainly include the following types: Netherlands Stamicarbon (Stamicarbon) CO 2 Air stripping process, Italian Snamprogetti ammonia stripping process, Japan TEC's ACES21 process, Swiss Casale's high-efficiency synthesis process, aqueous solution full circulation process, etc. Among them, the carbon dioxide stripping pr...

Examples

Embodiment Construction

[0037] Below in conjunction with accompanying drawing, the present invention will be further explained:

[0038] refer to figure 2 , in the high-pressure circle process, will be by CO 2 14.5MPa(A) compressed by the compressor, CO at 120°C 2 Gas, enters high pressure system in two parts, 75-85% CO 2 The gas enters the tube side of the high-pressure stripping tower 3 from the bottom, and the CO of 15-25% 2 The gas enters the urea synthesis tower 2 from the bottom to maintain its thermal balance; the high-pressure stripping tower 3 is a falling film heater, and the shell side is heated with 2.2MPa (A) steam to provide the ammonium carbamate decomposition source from the urea synthesis tower 2. The heat required, the stripping gas generated by the reaction (ie NH 3 and CO 2 Gas) enters the bottom tube side of the high-pressure tubular type total condensation reactor 1 from the top outlet of the high-pressure stripping tower 3 tube sides; NH in synthesis tower 2 3 and CO 2...