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Method for purifying flue gas

A flue gas and flue technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve problems such as expensive investment and harmful by-products

Inactive Publication Date: 2011-10-12
AIBANG CHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While many methods have been suggested, many produce very harmful by-products or require expensive inputs

Method used

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  • Method for purifying flue gas
  • Method for purifying flue gas
  • Method for purifying flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Determination of the Optimal Ammonium to Sodium Ratio in the Sodium Bicarbonate Precipitation Step

[0045] The following examples illustrate how the complex phase equilibrium chemistry involved in the present invention can be used to determine the optimal ratio of ammonium to sodium in the sodium bicarbonate precipitation step. The understanding of chemistry demonstrated by this example is required for all unit operations within the process.

[0046] The following equilibrium reaction equation represents the process in the sodium bicarbonate precipitation step (using either solid ammonium bicarbonate or carbon dioxide and ammonia);

[0047]

[0048]

[0049] To understand the complexity of the phase equilibrium behavior described in this reaction, a schematic representation of the system is required. The balanced salt pair quaternary system described in this reaction can be represented on an isothermal "stereomodel". However, these dioramas are difficult to use...

example 1

[0081] Example 1: Molar ratio of ammonium to sodium = 1.0

[0082] If the feedstock has 1 mole of Na+ and the ammonium to sodium ratio is 1.0, the feedstock composition can be as follows:

[0083] Na + =1mol (23.0g)

[0084] NH 4 + =1mol (18.0g)

[0085] HCO 3 - =1mol (61.0g)

[0086] SO 4 2- = 0.5 mol (48.0 g).

[0087] Using Janecke and the law of levers, the mass of solid sodium bicarbonate produced was 53.7 g. It can be appreciated that the solid is 100% sodium bicarbonate. Therefore, Na + and HCO 3 - The conversion to sodium bicarbonate was 63.9%.

example 2

[0088] Example 2: Maximum single-pass sodium bicarbonate output (A / S molar ratio = 0.912)

[0089] as mentioned, Figure 6 Midpoint D represents the feedstock that will produce the maximum yield of sodium bicarbonate on a one-way basis. Point D has Janecke coordinates of (0.477, 0.523). If the feedstock has 1 mole of Na + , then it contains 0.5 moles of SO 4 2- . NH 4 + and HCO 3 - The number of moles of is equal and can be obtained from:

[0090] 0.523 = Na + moles / (Na + moles+NH 4 + moles)

[0091] or

[0092] 0.477 = HCO 3 - moles / (HCO 3 - Number of moles+(2×SO 4 2- moles)

[0093] These give 0.912 moles of NH 4 + and HCO 3 - and a molar ratio of ammonium to sodium of 0.912. Therefore, we will have a feedstock with the following composition:

[0094] Na + =1mol (23.0g)

[0095] NH 4 + =0.912mol (16.4g)

[0096] HCO 3 - =0.912mol (55.6g)

[0097] SO 4 2- =0.5mol (48.0g)

[0098] Sum = 143.0g

[0099] As before, using Janecke and the la...

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Abstract

The invention relates to a method for producing a potassium-based fertilizer or a nitrogen-based fertilizer by a flue gas treatment process. Besides, the invention relates to a method for separating a fertilizer precursor from a flue gas flow. The method comprises an oxidation step including dry adsorbent operation, wet washing operation and removing air pollutants, a carbon dioxide trapping step and a sodium bicarbonate sedimentating step. The step comprising removal of the air pollutants is used for separating the precursor, and the precursor is used for fertilizer production. Besides, the invention relates to a method for removing carbon dioxide from the flue gas flow.

Description

technical field [0001] The present invention relates to a process for the production of potassium or nitrogen based fertilizers from flue gas treatment by-products. Background technique [0002] Methods of purifying flue gases have received attention. While many methods have been suggested, many produce very harmful by-products or require expensive inputs. Contents of the invention [0003] According to a broad aspect of the present invention there is provided a method of separating fertilizer salt precursors from a flue gas stream containing SOx, HCl, HF and NOx compounds, the method comprising the steps of: providing a flue gas stream; treating the flue gas to form feedstock, the processing comprising: a dry injection scrubbing operation; a wet scrubbing operation; and a carbon dioxide capture operation; converting the feedstock to form a sodium bicarbonate precipitate by a conversion step comprising: adding to the feedstock A compound salt of ammonium and Glauber's sa...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/78B01D53/81B01D53/60B01D53/62C05C1/00C05C3/00C05C5/02C05D7/00
CPCB01D53/60B01D53/62B01D53/64B01D53/75B01D53/78B01D53/81B01D2251/10B01D2251/304B01D2251/306B01D2257/302B01D2257/402B01D2257/404B01D2257/504B01D2257/602C05C1/00C05C3/00C05D7/00Y02A50/20Y02C20/10Y02C20/40Y02P20/151
Inventor M·E·A·默特森
Owner AIBANG CHINA CO LTD
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