Flue gas concerted catalytic denitration and demercuration technology

A synergistic catalysis and flue gas technology, applied in heterogeneous catalyst chemical elements, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of increasing equipment costs, waste water pollution, secondary pollution and other problems, to achieve the effect of saving renovation costs and reducing secondary pollution

Inactive Publication Date: 2016-02-24
无锡华光新动力环保科技股份有限公司
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AI-Extracted Technical Summary

Problems solved by technology

The process mainly uses a large amount of ammonia and lye, resulting in a large amount of wastewater pollution
[0007] Chinese patent CN103203160A discloses a combined flue gas desulfurization, denitrification and mercury removal device and its method, including two combined desulfurization, denitrification and mercury removal reactors, using ammonia injection and activated coke adsorption processes to improve the efficiency of desulfurization, denitrification and mercury removal, but It involves the regeneration of active coke and the reprocessing of desorbed impurities, causing secondary pollution
[0008] Chinese patent CN103394274A discloses a flue gas combined denitrification, demercury and desulfurization system device and its method, including a desulfurization absorption tower and a gypsum dehydrator connected to the des...
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Abstract

The invention provides a flue gas concerted catalytic denitration and demercuration technology. The technology realizes simultaneous removal of NOx and Hg<0> without arranging a flue gas purifying device, so the reconstruction cost of present apparatuses is saved, and pollution to atmosphere is reduced, thereby the technology has strong industrial application values. The technology comprises the following steps: 1, injecting ammonia gas fully mixed with air to a boiler flue gas through the nozzle of an ammonia injection grating, fully mixing, and converting NOx in the flue gas into N2 under the action of an upper portion honeycomb Ce-Cu-V-W-TiO2 composite catalyst; 2, introducing treated flue gas obtained in step 2, and carrying out catalytic oxidation on a tiny amount of O2 and HCl and Hg<0> under the action of a lower portion honeycomb Ce-Cu-V-W-TiO2 composite catalyst to generate HgCl2; and 3, allowing a treated gas obtained in step 2 to enter the operating unit of a desulfurization tower, capturing gaseous divalent mercury having high solubility in water by a wet washing system to remove the gaseous divalent mercury, and treating sulfur-containing compounds in the flue gas to recover elemental sulfur.

Application Domain

Gas treatmentHeterogenous catalyst chemical elements +2

Technology Topic

ChemistrySolubility +12

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  • Flue gas concerted catalytic denitration and demercuration technology

Examples

  • Experimental program(3)

Example Embodiment

[0020] Embodiment one:
[0021] A flue gas synergistic catalytic denitrification and mercury removal process, which comprises the following steps:
[0022] (1) Spray the ammonia gas that has been fully mixed with air into the boiler flue gas through the nozzle of the ammonia injection grid to make it fully mixed. At 350°C, the flow velocity in the catalyst hole is 7m/s, and the space velocity is 30001/h. The upper half of the honeycomb Ce-Cu-V-W-TiO at a surface velocity of 8m/h 2 Under the action of composite catalyst, the NO in the flue gas x converted to N 2.
[0023] (2) Pass the flue gas treated in step (1) through honeycomb Ce-Cu-V-W-TiO at 350°C 2 Under the action of the composite catalyst, a small amount of O 2 and HCl with Hg 0 Catalytic oxidation to generate HgCl 2.
[0024] (3) The gas treated in step (2) enters the operation unit of the wet oxidation desulfurization tower, the gaseous divalent mercury is easily soluble in water and is captured and removed by the wet scrubbing system, and the sulfur compounds in the flue gas are treated Recover elemental sulfur.
[0025] NO in this example x The removal efficiency is 98%, Hg 0 The removal efficiency is 98%.

Example Embodiment

[0026] Embodiment two:
[0027] A flue gas synergistic catalytic denitrification and mercury removal process, which comprises the following steps:
[0028] (1) Spray the ammonia gas that has been fully mixed with air into the boiler flue gas through the nozzle of the ammonia injection grid to make it fully mixed. At 380°C, the flow velocity in the catalyst hole is 7m/s, and the space velocity is 36001/h. The upper half of the honeycomb Ce-Mn-V-W-TiO at a surface velocity of 9m/h 2 Under the action of composite catalyst, the NO in the flue gas x converted to N 2.
[0029] (2) Pass the flue gas treated in step (1) into, at 380 o C via honeycomb Ce-Mn-V-W-TiO 2 Under the action of the composite catalyst, a small amount of O 2 and HCl with Hg 0 Catalytic oxidation to generate HgCl 2.
[0030] (3) The gas treated in step (2) enters the operation unit of the wet oxidation desulfurization tower, the gaseous divalent mercury is easily soluble in water and is captured and removed by the wet scrubbing system, and the sulfur compounds in the flue gas are treated Recover elemental sulfur.
[0031] NO in this example x The removal efficiency is 96%, Hg 0 The removal efficiency is 98%.

Example Embodiment

[0032] Embodiment three:
[0033] A flue gas synergistic catalytic denitrification and mercury removal process, which comprises the following steps:
[0034] (1) Spray the ammonia gas fully mixed with the air into the boiler flue gas through the nozzle of the ammonia injection grid to make it fully mixed. At 400°C, the flow velocity in the catalyst hole is 6m/s, and the space velocity is 40001/h. The upper half of the honeycomb Ce-Mn-V-W-TiO at a surface velocity of 8m/h 2 Under the action of composite catalyst, the NO in the flue gas x converted to N 2.
[0035] (2) Pass the treated flue gas in step (1), at 400 oC via honeycomb Ce-Mn-V-W-TiO 2 Under the action of the composite catalyst, a small amount of O 2 and HCl with Hg 0 Catalytic oxidation to generate HgCl 2.
[0036] (3) The gas treated in step (2) enters the operation unit of the wet oxidation desulfurization tower, the gaseous divalent mercury is easily soluble in water and is captured and removed by the wet scrubbing system, and the sulfur compounds in the flue gas are treated Recover elemental sulfur.
[0037] NO in this example x The removal efficiency is 97%, Hg 0 The removal efficiency is 99%.

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Description & Claims & Application Information

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