Method for treating decomposed gas by low resistance vertical calandria type absorptive condenser

A condenser and tube-and-tube technology is applied in the absorption field of ammonia and carbon dioxide mixed gas, which can solve the problems of difficult heat balance and water volume control, high investment cost, and high equipment investment in the circulating absorption part, and achieves good application prospects and condensation heat. Effective, absorptive capacity-enhancing effect

Active Publication Date: 2006-02-22
SICHUAN LUTIANHUA
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Problems solved by technology

In general, the design is carried out on the shell side according to the condensation absorption process, that is, the shell and the tubes must contact the corrosive methylammonium liquid medium, so the whole equipment must be made of high-grade stainless steel, so that Causing high investment in equipment
[0005] Relevant domestic enterprises have also adopted pre-condensers in the capacity expansion of the circulation system, but their structure is of parallel type, and the absorption liquid in the follow-up section is not added as the absorbent, which leads to the blockage of th

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  • Method for treating decomposed gas by low resistance vertical calandria type absorptive condenser
  • Method for treating decomposed gas by low resistance vertical calandria type absorptive condenser

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[0011] The present invention will be further described below in conjunction with the accompanying drawings: figure 1 As shown, the temperature from the rectification tower is 105-112°C, the decomposition gas containing about 34% ammonia, about 51% carbon dioxide, and the rest is water vapor is introduced into the upper pipe box of the precondenser and distributed to In each tube, the dilute methylammonium solution with a total concentration of 47-53% is evenly distributed by the nozzles. The spray angle of the nozzle for spraying the absorbent dilute methylammonium solution is 90-120° and sprays evenly into each tube and inside the tube During the top-down flow process of the gas-liquid mixture, part of the ammonia and carbon dioxide are absorbed into the liquid phase, and the heat of dissolution and chemical reaction is released, and the gas and liquid mixture of the pre-absorption condenser is controlled at a temperature not lower than At 75°C, it is introduced into the origina...

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Abstract

The invention discloses a method for processing decay gas with a low resistance vertical tubular aspiration condenser, which contains the following: mixture gas being added from the head of condenser and distributed to every tube, dilute methanaminium solution being added from the head of condenser as an absorber, thus the gas- liquid mixture being formed in the tube, during the gas- liquid mixture flowing from up to down, partial ammonia and carbon dioxide being absorbed into liquid phase by dissolution and reaction and dissolving heat and reaction heat released and then shifted by water. The invention has merits as the following: the operation flexible, the absorption power improving more than 50%, the condensation heat controlled effectively. And the technique has a good application prospect.

Description

Technical field [0001] The invention relates to a method for absorbing mixed gas of ammonia and carbon dioxide, in particular to a method for processing decomposed gas with a vertical column-and-tube absorption condenser with low resistance drop. technical background [0002] The decomposition gas in the urea production process mainly contains ammonia, carbon dioxide, water vapor, and some inert gas, and its specific composition varies with the composition of the synthesis reaction liquid and the decomposition process parameters. The ammonia and carbon dioxide in the decomposition gas are recovered and recycled to the synthesis process. In the early stage of urea production, the "hot gas circulation method" appeared, because the hot NH 3 and CO 2 Direct compression is likely to cause technical difficulties such as crystallization in the gas phase and high-temperature compression, so it has not been industrialized. In the current various processes of urea production, the (m...

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Application Information

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IPC IPC(8): B01D5/00C07C273/00
Inventor 周寅仪茅启昌刘勇李勇
Owner SICHUAN LUTIANHUA
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