Fluid catalytic cracking (FCC) flue gas treatment method

A process method and flue gas technology, applied in separation methods, chemical instruments and methods, air quality improvement and other directions, can solve the problems of small effective contact area, large equipment volume, low space utilization rate, etc., to save alkali consumption, increase The effect of treating water volume and improving treatment cost

Inactive Publication Date: 2012-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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Problems solved by technology

[0014] CN1895744A introduces a high-dust composite SCR flue gas denitrification process and denitrification catalytic reaction device. This SCR process is mainly aimed at NOx in power plant flue gas, and is not suitable for NOx in FCC flue gas. x governance
[0015] Flue gas-alkali reverse contact towers are widely used in flue gas desulfurization, including pa

Method used

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  • Fluid catalytic cracking (FCC) flue gas treatment method
  • Fluid catalytic cracking (FCC) flue gas treatment method
  • Fluid catalytic cracking (FCC) flue gas treatment method

Examples

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Example Embodiment

[0048] Example 1 (see figure 2 )

[0049] Flue gas from FCC boiler system 1, air volume 6m 3 / h, temperature 300℃~400℃, containing 1000mg / m 3 NO x , 1000mg / m 3 SO 2 , the flue gas enters the flue gas-ammonia gas mixer 4, where the flue gas is fully and evenly mixed with the ammonia gas from the ammonia supply unit 2, and the amount of ammonia gas is 6L / h (the amount of ammonia is NO in the flue gas). x The amount required for the complete reaction), the mixed gas then enters the catalytic reduction reactor 4 downward, and the catalyst adopts a catalyst containing V, Ti, W and other components, which has good catalytic activity for the SCR reaction.

[0050] In the catalyst bed, NO x and NH 3 The reaction produces N 2 and H 2 O, the denitrified flue gas from the catalytic reduction reactor 4 enters the heat exchanger 5, and after the waste heat is recovered, the flue gas is cooled from 340°C to 80°C. After cooling down, the flue gas enters the rotating bed absorption...

Example Embodiment

[0055] Example 2 (see figure 2 )

[0056] Flue gas from FCC boiler system 1, air volume 100m 3 / h, temperature 300℃~400℃, containing 500mg / m 3 NO x , 2000mg / m 3 SO 2 , the flue gas enters the flue gas-ammonia gas mixer 4, where the flue gas is fully and evenly mixed with the ammonia gas from the ammonia supply unit 2, and the amount of ammonia gas is 50L / h (the amount of ammonia is NO in the flue gas). x The amount required for the complete reaction), the mixed gas then enters the catalytic reduction reactor 4 downward, and the catalyst adopts a catalyst containing V, Ti, W and other components, which has good catalytic activity for the SCR reaction.

[0057] In the catalyst bed, NO x and NH 3 The reaction produces N 2 and H 2 O, the denitrified flue gas from the catalytic reduction reactor 12 enters the heat exchanger 5, and after the waste heat is recovered, the flue gas is cooled from 340°C to 70°C. After cooling down, the flue gas enters the rotating bed absorpt...

Example Embodiment

[0062] Example 3 (see figure 2 )

[0063] Flue gas from FCC boiler system 1, air volume 2000m 3 / h, temperature 300℃~400℃, containing 500mg / m 3 NO x , 2000mg / m 3 SO 2 , the flue gas enters the flue gas-ammonia gas mixer 4, where the flue gas is fully and uniformly mixed with the ammonia gas from the ammonia supply unit 2, and the amount of ammonia gas is 100L / h (the amount of ammonia is NO in the flue gas). x The amount required for the complete reaction), the mixed gas then enters the catalytic reduction reactor 4 downward, and the catalyst adopts a catalyst containing V, Ti, W and other components, which has good catalytic activity for the SCR reaction.

[0064] In the catalyst bed, NO x and NH 3 The reaction produces N 2 and H 2 O, the denitrified flue gas from the catalytic reduction reactor 4 enters the heat exchanger 5, and after the waste heat is recovered, the flue gas is cooled from 340°C to 70°C. After cooling down, the flue gas enters the rotating bed abs...

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Abstract

The invention discloses a fluid catalytic cracking (FCC) flue gas treatment method, which comprises the following steps of: mixing FCC flue gas and ammonia, performing selective reduction denitration reaction of NOx in the presence of a catalyst, performing revolving bed absorption desulfuration on the flue gas subjected to the selective reduction denitration reaction by using discharged water obtained after H2S is removed from acidic water as absorption liquid, further performing alkali liquid absorption desulfuration on the flue gas subjected to the revolving bed absorption desulfuration, discharging the flue gas, mixing the liquid phase discharged after the revolving bed absorption desulfuration and the acidic water to regulate the pH value of the acidic water to between 4 and 6, blowing out H2S by using air, burning the blown H2S in an incinerator, and treating the sewage in a sewage treatment plant after the H2S is blown out. By the method, the denitration and desulfuration processes of the FCC flue gas are finished; and the H2S in the acidic water is removed by using the obtained diluted acid, so that the acid consumption in the acidic water treatment is saved, and the acidic water treatment cost and the FCC flue gas treatment cost are reduced.

Description

technical field [0001] The invention relates to a process method for treating FCC flue gas of an oil refinery, in particular to a process method for denitration and desulfurization of the FCC flue gas of a refinery. Background technique [0002] NOx and SOx are one of the main sources of air pollution. NOx and SOx in the atmosphere mainly come from exhaust gases from industrial processes related to combustion processes and exhaust emissions from motor vehicles and ships. [0003] Nitrogen oxides are collectively referred to as NOx, and the most harmful ones are: NO, NO 2 . The main hazards of NOx are as follows: (1) toxic to the human body; (2) toxic to plants; (3) can form acid rain and acid fog; (4) form photochemical smog with hydrocarbons; (5) destroy the ozone layer . [0004] In the atmosphere, SO 2 It will be oxidized to form sulfuric acid mist or sulfate aerosol, which is an important precursor of environmental acidification. The concentration of sulfur dioxide...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/60B01D53/52
CPCY02A50/20
Inventor 李勇刘忠生
Owner CHINA PETROLEUM & CHEM CORP
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