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CO2 gas-striping parallel /serial connection medium-pressure urea energy-saving and yield-increasing novel technology

A new process, medium-pressure technology, which is applied in the process field of improving the production capacity of CO2 stripping urea process unit and reducing energy consumption, can solve the problems of low conversion rate of urea synthesis tower, increased steam and electricity consumption, etc., and achieves a significant increase in production effect. , The effect of reducing the consumption of circulating cooling water and saving energy

Active Publication Date: 2014-05-28
王庆锋 +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CO 2 The output of the gas stripping parallel medium pressure process unit has been improved, but there are varying degrees of increased steam and electricity consumption, urea synthesis tower CO 2 Problems such as low conversion rate

Method used

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  • CO2 gas-striping parallel /serial connection medium-pressure urea energy-saving and yield-increasing novel technology

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Embodiment 1

[0030] With the method of the present invention, domestic existing 400,000 tons / year CO 2 The air-lifting urea unit underwent energy-saving and production-increasing transformation, and the production capacity was increased from 1,350 tons / day to 2,000 tons / day, and the transformation investment cost was 32 million yuan; after the transformation, the steam consumption per ton of urea was reduced by 30-60kg, and the unit consumption was 940-970kg; The consumption is reduced by 8-12 kWh, and the unit consumption is 78 kWh; the consumption of circulating cooling water is also greatly reduced; 400,000 tons / year of CO 2 After the successful transformation of the gas stripping urea unit, the company shut down the 200,000-ton / year aqueous solution full-circulation urea production unit. Before the aqueous solution unit was shut down, the average steam consumption per ton of urea was 1250 kg, and the power consumption was 160 kWh. According to the market price, the cost of urea product...

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Abstract

The invention provides a CO2 gas-stripping parallel / serial connection medium-pressure urea energy-saving and yield-increasing novel technology. The conventional CO2 gas-stripping urea technology equipment is parallelly connected to a medium-pressure decomposition system, is serially connected to a medium-pressure pre-separator and an evaporation pre-condensation system, and is added with a medium-pressure methylamine recycling system. In a urea synthesis tower, materials are divided into two parts according to a certain ratio, one part of the materials is transported to the medium-pressure decomposition system and is subjected to processes of flash separation, liquid rectification, thermal decomposition, and CO2 air stripping; the other part of the materials is discharged from a CO2 stripping tower, then is decompressed, and finally is subjected to flash separation in the medium-pressure pre-separator; the urine in the medium-pressure system is decompressed and then transported to a low-pressure rectification tower; the medium-pressure decomposition gas phase and the low-pressure methylamine are mixed and transported to the heat utilization section shell pass of an evaporation pre-condensation device, and the urine in the tube pass is heated to evaporate and thus is condensed by utilizing the heat generated by bubbling reactions. The CO2 air-stripping parallel / serial connection medium-pressure urea energy-saving and yield-increasing novel technology can increase the production capacity by 30 to 60% or more compared to that of original CO2 air-stripping urea device, and has the advantages of simple technology process, convenient operation control, reduction on steam and electricity consumption, and high reconstruction investment profit.

Description

technical field [0001] The invention relates to a urea production process and system, specifically, a method for increasing CO 2 The production capacity of gas stripping urea process equipment and the process of reducing energy consumption. Background technique [0002] In the mid-1960s, the Dutch company Stamicarbon successfully developed a competitive CO 2 Air stripping urea production process, currently more than 80% of newly built urea plants at home and abroad adopt this process. Since the 1990s, CO 2 The production technology of air stripping urea has been continuously innovated, and there have been traditional CO 2 Gas stripping (secondary washing) process, improved CO 2 Gas stripping (also known as dehydrogenation) process, a new generation of improved CO 2 Gas stripping (pool methylammonium condenser) process and urea 2000 +TM The process technology has been successfully developed and industrialized, making CO 2 The gas-stripping urea process unit has strong ...

Claims

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Application Information

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IPC IPC(8): C07C273/04
Inventor 王庆锋居晓
Owner 王庆锋
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