Method for removing mercury in flue gas using V2O5/carbon material catalyst

Abstract

Disclosed is a method for applying a V2O5 / carbon material catalyst to remove mercury in flue gas, which comprises: feeding the catalyst into a fixed bed reactor, controlling the reaction temperature at between 120 and 180DEG C, and inputting atmospheric mercury-bearing flue gas, wherein, the concentration of mercury is 0.5 to 3070mu g / m3, and the air speed ranges from 10000 to 100000h-1; and the catalyst is the V2O5 / carbon material catalyst, and has the compositions, in weight percentage: 90 to 99.5 percent of carbon material, and 0.5 to 10 percent of vanadium oxide by taking V2O5 as a unit of measurement. The invention has the advantages of rather high catalytic oxidation removal capability to mercury, reducing the running cost and solving the secondary pollution.

Description

Technical field

[0001] The invention relates to a method for removing elemental mercury in flue gas, in particular to an application V 2 O 5 / Carbon material catalyst catalytic oxidation method to remove mercury from flue gas. Background technique

[0002] Coal is my country's main energy source. With the development of my country's economy in recent years, the use of coal has also increased. The resulting environmental pollution problems have become more prominent, seriously affecting the ecological environment, human health, and sustainable economic development. Therefore, efficiently solving the problem of coal-burning pollution is an important part of my country's sustainable energy development. Mercury is one of the harmful heavy metal pollutants released by coal combustion, which can cause great harm to the environment and human body. Although developed countries have invested heavily in related research, they have not yet formed an economical and effective control techno...

Examples

Embodiment 1

[0015] 1 gram of activated coke uses 1 ml of 0.1 mol / L NH 4 VO 3 -H 2 C 2 O 4 The solution is immersed for 10 hours, then dried at 110°C for 12 hours, and calcined at 500°C for 2 hours in an argon atmosphere to obtain 1wt% V 2 O 5 / Activated coke catalyst.

[0016] The catalyst was packed in a fixed-bed quartz tube reactor, and both ends were fixed with quartz wool. After the catalyst was heated to 120℃ in the reactor, Hg-containing 0 Simulated flue gas, airspeed 10000h -1 , Constant temperature adsorption for 24h. The composition of the simulated flue gas is: 6.3% O 2 , 6% H 2 O, 1500ppm SO 2 , N 2 For balance gas, Hg 0 The concentration is 420μg / m 3 . Similarly, the mercury removal experiment on activated carbon under the same conditions was carried out as a comparison. The result of the experiment is that the mercury absorption of the catalyst reaches 206 μg / g-catalyst in 24 hours, and the mercury absorption of activated carbon is 19 μg / g-activated carbon.

Embodiment 2

[0018] 1 gram of activated coke uses 1 ml of 0.05 mol / L NH 4 VO 3 -H 2 C 2 O 4 The solution is immersed for 2 hours, then dried at 110°C for 12 hours, and calcined at 450°C for 5 hours in an argon atmosphere to obtain 0.5wt% V 2 O 5 / Activated coke catalyst.

[0019] The catalyst was packed in a fixed-bed quartz tube reactor, and both ends were fixed with quartz wool. After the catalyst was heated to 120℃ in the reactor, Hg-containing 0 Simulated flue gas, airspeed 15000h -1 , Constant temperature adsorption for 24h. The composition of the simulated flue gas is: 6.3% O 2 , 6% H 2 O, 1000ppm SO 2 , N 2 For balance gas, Hg 0 The concentration is 420μg / m 3 . The result of the experiment is that the mercury absorption of the catalyst reaches 140μg / g-catalyst in 24h.

Embodiment 3

[0021] 1 g activated carbon fiber

[0022] Use 1ml 0.5mol / L NH 4 VO 3 -H 2 C 2 O 4 The solution is immersed for 5 hours, then dried at 110°C for 12 hours, and then calcined at 350°C for 10 hours in an argon atmosphere to obtain 5wt% V 2 O 5 / Activated carbon fiber catalyst.

[0023] The catalyst was packed in a fixed-bed quartz tube reactor, and both ends were fixed with quartz wool. After the catalyst was heated to 120℃ in the reactor, Hg-containing 0 Simulated flue gas, airspeed 10000h -1 , Constant temperature adsorption for 24h. The composition of the simulated flue gas is: 6.3% O 2 , 6% H 2 O, 1500ppm SO 2 , N 2 For balance gas, Hg 0 The concentration is 420μg / m 3 . The result of the experiment is that the mercury absorption of the catalyst reaches 234μg / g-catalyst in 24h.

Technical field

[0001] The invention relates to a method for removing elemental mercury in flue gas, in particular to an application V 2 O 5 / Carbon material catalyst catalytic oxidation method to remove mercury from flue gas. Background technique

[0002] Coal is my country's main energy source. With the development of my country's economy in recent years, the use of coal has also increased. The resulting environmental pollution problems have become more prominent, seriously affecting the ecological environment, human health, and sustainable economic development. Therefore, efficiently solving the problem of coal-burning pollution is an important part of my country's sustainable energy development. Mercury is one of the harmful heavy metal pollutants released by coal combustion, which can cause great harm to the environment and human body. Although developed countries have invested heavily in related research, they have not yet formed an economical and effective control techno...

Examples

Embodiment 1

[0015] 1 gram of activated coke uses 1 ml of 0.1 mol / L NH 4 VO 3 -H 2 C 2 O 4 The solution is immersed for 10 hours, then dried at 110°C for 12 hours, and calcined at 500°C for 2 hours in an argon atmosphere to obtain 1wt% V 2 O 5 / Activated coke catalyst.

[0016] The catalyst was packed in a fixed-bed quartz tube reactor, and both ends were fixed with quartz wool. After the catalyst was heated to 120℃ in the reactor, Hg-containing 0 Simulated flue gas, airspeed 10000h -1 , Constant temperature adsorption for 24h. The composition of the simulated flue gas is: 6.3% O 2 , 6% H 2 O, 1500ppm SO 2 , N 2 For balance gas, Hg 0 The concentration is 420μg / m 3 . Similarly, the mercury removal experiment on activated carbon under the same conditions was carried out as a comparison. The result of the experiment is that the mercury absorption of the catalyst reaches 206 μg / g-catalyst in 24 hours, and the mercury absorption of activated carbon is 19 μg / g-activated carbon.

Embodiment 2

[0018] 1 gram of activated coke uses 1 ml of 0.05 mol / L NH 4 VO 3 -H 2 C 2 O 4 The solution is immersed for 2 hours, then dried at 110°C for 12 hours, and calcined at 450°C for 5 hours in an argon atmosphere to obtain 0.5wt% V 2 O 5 / Activated coke catalyst.

[0019] The catalyst was packed in a fixed-bed quartz tube reactor, and both ends were fixed with quartz wool. After the catalyst was heated to 120℃ in the reactor, Hg-containing 0 Simulated flue gas, airspeed 15000h -1 , Constant temperature adsorption for 24h. The composition of the simulated flue gas is: 6.3% O 2 , 6% H 2 O, 1000ppm SO 2 , N 2 For balance gas, Hg 0 The concentration is 420μg / m 3 . The result of the experiment is that the mercury absorption of the catalyst reaches 140μg / g-catalyst in 24h.

Embodiment 3

[0021] 1 g activated carbon fiber

[0022] Use 1ml 0.5mol / L NH 4 VO 3 -H 2 C 2 O 4 The solution is immersed for 5 hours, then dried at 110°C for 12 hours, and then calcined at 350°C for 10 hours in an argon atmosphere to obtain 5wt% V 2 O 5 / Activated carbon fiber catalyst.

[0023] The catalyst was packed in a fixed-bed quartz tube reactor, and both ends were fixed with quartz wool. After the catalyst was heated to 120℃ in the reactor, Hg-containing 0 Simulated flue gas, airspeed 10000h -1 , Constant temperature adsorption for 24h. The composition of the simulated flue gas is: 6.3% O 2 , 6% H 2 O, 1500ppm SO 2 , N 2 For balance gas, Hg 0 The concentration is 420μg / m 3 . The result of the experiment is that the mercury absorption of the catalyst reaches 234μg / g-catalyst in 24h.