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Flue gas purification method

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

Inactive Publication Date: 2010-06-09
AIRBORNE CLEAN ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 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
[0008] 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

[0059] Inject NaHCO at 6.6 kg / hr in all three ports 20a, 20b, 20c at 150°C for a short period (5 minutes) 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.

[0060] 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.

[0061] Table 3 summarizes the NaHCO 3 Average flue gas composition at combustor outlet and scrubber inlet before injection.

[0062]

[0063] Note that all concentrations are reported on a volumetric and dry basis.

[0064] 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.

[0065]

[0066] Table 5 shows the flue gas composition injected at port 20a for 1 hour.

[0067]

[0068] NaHCO 3 Injecti...

Embodiment 2

[0077] 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 187 l of 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.

[0078] 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.

[0079] Table 8 summarizes the NaHCO 3 Average flue gas composition at combustor outlet and scrubber inlet before injection.

[0080]

[0081] 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.

[0082]

[0083] As can be seen ...

Embodiment 3

[0085] 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 187 l of 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.

[0086] Start injecting NaHCO at port 20c 3 , followed by 20a.

[0087] Table 10 shows the average injection temperature for each port.

[0088]

[0089] Table 11 summarizes the NaHCO 3 Average flue gas composition at combustor outlet and scrubber inlet before injection.

[0090]

[0091] Injection of sodium bicarbonate started at 1237 am at port C (0.5 sec dwell time) followed by port A for 60 min each.

[0092] Table 12 summarizes the flue gas composition at the time of injection.

[0093]

[0094] by injecting NaHCO at the 3 residence times of all trials 3 , NO and SO at the scrubber inlet 2 reduce simult...

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Abstract

A method of scrubbing mercury compounds and nitrogen oxides from a gas stream employing a scrubbing operation. The method involves the contact of the stream which contains mercury, SOx and NOx compounds with a sorbent to remove at least a portion of the latter compounds. This results in a partially cleaned stream. The method further involves contacting the latter stream with an oxidant to oxidize and remove substantially all residual nitrogen oxides, mercury and mercury compounds remaining in the stream.

Description

[0001] This application is a divisional application of a Chinese patent application with an application date of October 1, 2003, an application number of 200380104718.5, and an invention title of "flue gas purification method". technical field [0002] 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 [0003] 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. [0004] The world's prior art establishes a number of wet chemical absorption processes mainly incorporat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/81B01D53/78B01D53/60F23J15/04
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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