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Method for removing ammonia and dust from a waste gas that results during the production of fertilizers

A technology for preparing fertilizers and removing ammonia, applied in chemical instruments and methods, ammonium salt fertilizers, separation methods, etc.

Inactive Publication Date: 2008-11-19
UHDE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a limit to this maximum concentration in methods to date

Method used

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  • Method for removing ammonia and dust from a waste gas that results during the production of fertilizers
  • Method for removing ammonia and dust from a waste gas that results during the production of fertilizers

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Embodiment Construction

[0015] The plant for carrying out the method initially has a first scrubber 1 and a second scrubber 2 . The first scrubber 1 is preceded by a pre-cleaning stage 3 . A droplet separator 4 (demister) is installed in the upper region of the first scrubber 1 , likewise on the second scrubber 2 there is also a droplet separator 5 . The first scrubber 1 is divided into two scrubbing zones, in which a separating plate 12 (such as a bubble cap plate) and an outlet through which the liquid cannot pass, but which the gas can pass, are provided below the droplet separator 4 in order to form a fine scrubbing zone 14 11. Below the separating plate 12 is the main washing zone 21 of the first washer 1 .

[0016] The aforementioned plant components are preferably part of a plant for the production of fertilizer, preferably urea, and are connected to a granulator and cooler, not shown. The ammonia- and dust-laden exhaust gas is fed from a granulator (not shown) first into the pre-cleaning s...

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Abstract

The invention relates to a method for removing ammonia and dust from a waste gas that results during the production of fertilizers, preferably urea, during which the waste gas is introduced into a first washer (1), a cooling gas (7) is introduced into a second washer (2), and additional water (8, 9) is introduced into one washer, and an aqueous solution is introduced into the other washer, whereby both the waste gas as well as the cooling gas pass through at least one drop eliminator (4, 5) before exiting the respective washer. The aim of the invention is to improve the aforementioned method in order to enable a distinct reduction in the pollution caused by waste gas. To this end, the additional water is firstly introduced into a fine washing area (14) of the first washer, said area being delimited at the top by the drop eliminator and at the bottom by a liquid-impermeable false bottom (12), and is sprayed onto the at least one drop eliminator, and the aqueous solution accruing in the fine washing area is subsequently introduced into the second washer.

Description

technical field [0001] The invention relates to a method for removing ammonia and dust from exhaust gases produced during the production of fertilizers, preferably urea, in which process the exhaust gases are introduced into a first scrubber and cooling air into a second scrubber and added water into a The first scrubber and the aqueous solution formed in the first scrubber are passed into the second scrubber, where both the exhaust gas and the cooling gas pass through at least one droplet separator before being discharged from the respective scrubber. Background technique [0002] During the production of ammonia-containing fertilizers, or in the case of fertilizers from which ammonia can be decomposed, such as urea-containing fertilizers, ammonia-containing and dust-containing exhaust gas streams are produced in various process stages, which must be treated before being discharged into the environment or returned to the process. purify. Such exhaust gases are generated in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/58B01D47/06C05C1/00B01D53/77C05C3/00C05C9/00
CPCC05C3/00B01D53/58Y02A50/20
Inventor P·尼许斯H·弗兰茨拉赫
Owner UHDE GMBH
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