Flue gas purification method

A flue and airflow technology, applied in chemical instruments and methods, separation methods, air quality improvement, etc., can solve the problems of complexity of smoke flow control, low efficiency of sulfur trioxide or sulfuric acid aerosol removal, etc.

Inactive Publication Date: 2006-01-11
AIRBORNE CLEAN ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Evident in current flue gas treatment schemes, NO and NO x Formation presents complexities in smoke control
Therefore, the presence of plume requires additional unit operations and still results in plume being present at tolerable levels
[0007] Wet scrubbing systems using lime, limestone, baking soda, or other alkaline compositions have proven effective in removing sulfur dioxide, but are very ineffective for removing sulfur trioxide or sulfuric acid aerosols

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Inject NaHCO at a rate of 6.6 kg / hr at 150C over a short period of time (5 minutes) at all three ports 20a, 20b, 20c 3 , to observe it for SO 2 and NO x concentration effect. This was followed by a 1 hour continuous injection at port 20a after the short injection.

[0055] Sodium carbonate (Na 2 CO 3 ) aqueous solution was used as the wash solution and was added during the test to maintain the solution pH at approximately 7.

[0056] Table 3 - Flue gas composition before injection

[0057] Note that all concentrations are reported on a volumetric and dry basis.

[0058] Injection of sodium bicarbonate started at 0240 pm at port 20c (0.5 sec residence time) followed by ports 20b and 20a for 5 min each. Table 4 summarizes the flue gas composition at the time of injection.

[0059] Table 4 - During short-term (5min) sorbent injection,

[0060] Table 5 - At 1 hour sorbent injection at port 20a, at combustion

[0061] NaHCO 3 Injection i...

Embodiment 2

[0068] This test is performed by injecting NaHCO at three ports at a flow rate of 5.5kg / hr and an injection temperature of 150°C 3 conduct. The injection time at each port lasted 1 hour. Pre-filled wash solution: 1 kg of Na dissolved in 1871 water 2 CO 3 , 29kg of Na 2 SO 4 and 19kg of Na 2 SO 3 . The pH of the prepared solution was about 10.6.

[0069] Start injecting NaHCO at port 20c 3 , and subsequently at ports 20b and 20a. Immediately after each injection is complete, the filter downstream of the injection port CEM system is changed to ensure an accurate readout of the flue gas composition.

[0070] Table 8 - Flue gas composition before injection

[0071] NaHCO injection started at 1237am at port 20c (0.5sec residence time) 3 , followed by 20a, each port lasted 60min. Table 9 summarizes the flue gas composition at the time of injection.

[0072] Table 9 - Flue gas composition during injection

[0073] As can be seen from the data shown ab...

Embodiment 3

[0075] In this example, NaHCO was performed at three ports at a flow rate of 7.7 kg / hr and an injection temperature of 150°C. 3 Injection. The injection time at each port lasted 1 hour. Pre-filled wash solution: 1 kg of Na dissolved in 1871 water 2 CO 3 , 29kg of Na 2 SO 4 and 19kg of Na 2 SO 3 . The pH of the prepared solution was about 10.6.

[0076] Start injecting NaHCO at port 20c 3 , followed by 20a.

[0077] Table 10 - Average Injection Temperature (°C)

Port 20a

Port 20b

Port 20c

upstream

downstream

upstream

downstream

upstream

downstream

155±3

132±5

157±1

133±0

157±5

139±5

[0078] Table 11 - Flue gas composition before injection

combustion chamber outlet

Scrubber inlet

O 2 (％)

2.14±0.33

4.38±0.19

CO 2 (%)

15.95±0.29

14.23±0.45

CO (ppm)

10±85

28±5

NO x (ppm)

545±1...

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Abstract

The present invention provides a method of scrubbing SOx, NOx compounds and other air toxins from a flue gas stream. In the method, two distinct unit operations are amalgamated to scrub SOx, NOx and other air toxins compounds from a flue gas stream. More specifically, there is a dry scrubbing operation and a wet scrubbing operation. The dry injection scrubbing operation involves contacting a flue gas stream containing SOx and NOx compounds with a sorbent for removing substantially all of the SOx and NOx compounds present in the stream. The second wet scrubbing operation involves contacting the stream to remove any residual SOx, NOx compounds, and other air toxins remaining in the stream.

Description

technical field [0001] The present invention relates to a flue gas purification method, more particularly, the present invention relates to a method that combines dry injection and wet scrubbing unit operations to fully eliminate SO in flue gas x and NO x Compounds and other air-toxic compounds flue gas cleaning methods. Background technique [0002] With new stringent regulations in the US and elsewhere, greater progress must be made today with respect to fossil fuels. It is well known that the use of fossil fuels contributes significantly to air pollution, and numerous patents have been issued with the aim of reducing the pollution problem. [0003] The world's prior art establishes a number of wet chemical absorption processes mainly incorporating wet scrubbers in which hot polluted gases are washed or detoxified with neutralizing solutions in a gas-liquid contact unit. The neutralizing solution may typically be any suitable aqueous alkaline liquid or slurry to remove ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/60
CPCB01D53/60Y02A50/20B01D53/02
Inventor M·莫尔森J·毕奇尔S·沙夫D·约翰逊
Owner AIRBORNE CLEAN ENERGY
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