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Method for removing free ammonia in urea powder

A technology for free ammonia and urea, which is applied in urea compound fertilizer, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of ammonia escape from urea granulation tower, avoid low removal efficiency, good effect, and enhance functionality. Effect

Inactive Publication Date: 2018-03-06
刘金成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The invention provides a method for removing free ammonia in urea dust to solve the problem of ammonia escape at the top of the urea prilling tower

Method used

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  • Method for removing free ammonia in urea powder
  • Method for removing free ammonia in urea powder
  • Method for removing free ammonia in urea powder

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Embodiment 1

[0027] Embodiment 1: as figure 2 Shown, the present invention removes the method for free ammonia in urea dust and comprises the steps:

[0028] a. The urea melt is heated and concentrated in the first-stage evaporator 8, gas-liquid separated in the first-stage separator 9, further heated and concentrated in the second-stage evaporator 10, and gas-liquid separated again in the second-stage separator 11, and then fed into the melting pump 12 to fully mix and add pressure;

[0029] b. According to the content of free ammonia in the urea melt, the prepared sulfuric acid aqueous solution (or nitric acid, hydrochloric acid, phosphoric acid, H 2 CO 3 Inorganic acid aqueous solution or organic acid aqueous solution such as lactic acid, formic acid, acetic acid, oxalic acid, citric acid, malic acid) passes through the acid storage tank 6 and then is pumped into the pipeline a between the first-stage evaporation separator 9 and the second-stage evaporator 10 through the metering pum...

Embodiment 2

[0031] Embodiment 2: as image 3 As shown, the difference between this embodiment and embodiment 1 is:

[0032] a. The urea melt enters the melt pump 12 after passing through the first-stage evaporator 8, the first-stage separator 9, the second-stage evaporator 10 and the second-stage separator 11 in sequence;

[0033] b. According to the content of free ammonia in the urea melt, the prepared sulfuric acid aqueous solution (or nitric acid aqueous solution or hydrochloric acid aqueous solution or phosphoric acid aqueous solution or carbonic acid and other inorganic acids or organic acids such as lactic acid, formic acid, acetic acid, oxalic acid, citric acid and malic acid) Aqueous solution) passes through the acid storage tank 6 and is pumped into point b of the pipeline between the second-stage evaporation separator 11 and the melting pump 12 through the metering pump 7, and the added acid solution and urea melt are mixed in the pipeline to neutralize the urea in the solution...

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Abstract

The invention discloses a method for removing free ammonia in urea powder. The method comprises the following steps: pumping a urea melted liquid into a melt pump after passing through a first-stage evaporator, a first-stage separator, a second-stage evaporator and a second-stage separator, then pumping an inorganic acid or organic acid solution in an acid storage tank into a pipeline between thefirst-stage evaporator separator and the second-stage evaporator or a pipeline between the second-stage evaporator separator and the melt pump after metering, and then pelleting into a pelleting towerafter passing through the melt pump. The free ammonia is removed by using acid-base neutralization, the effect is good, and the problem that the removal efficiency is low in a conventional method isavoided. While tail gas achieves the removal of free ammonia, nutrient elements such as sulfur element necessary for crop growth are added through the products of acid-base neutralization in urea product, the combination modes of elements such as nitrate nitrogen in the product are enriched, the functionality of the product is strengthened, the quality of the product is improved, the energy-savingand environmentally-friendly effects are improved, no secondary pollution is generated, the technology is simple, the operability is high, and the removal effect for free ammonia in urea particles ordust is obvious.

Description

technical field [0001] The invention relates to a method for removing free ammonia in urea dust, in particular to the treatment of free ammonia in the urea granulation process. technical background [0002] The problem of ammonia escape from the dust recovery unit of the urea prilling tower is a technical problem for all urea production enterprises, and it is also a key link in the environmental governance work of the enterprises. At present, there are many methods of dust recovery devices in the prilling tower of the urea plant. Although each has its own advantages in terms of dust recovery effects, there is generally a serious problem of ammonia escape. In the final analysis, the escape of ammonia is the existence of free ammonia in the process of urea granulation. Free ammonia volatilizes with the decompression of urea melt during granulation, and is discharged into the atmosphere along with urea dust. Therefore, how to solve the problem of free ammonia in the urea granu...

Claims

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Application Information

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IPC IPC(8): C07C273/16C05C9/00
CPCC05C9/00C07C273/16
Inventor 刘金成钱进华刘慧琴
Owner 刘金成
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