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A multifunctional composite gas purification membrane material with denitrification and dust removal functions

A composite gas and purification membrane technology, applied in the field of gas purification, can solve the problems of long gas purification process, poisoning of denitration catalysts, and large floor space, shortening the exhaust gas purification process, improving the efficiency of heat recovery and utilization, and reducing the size. Effect

Active Publication Date: 2020-07-03
南京科赫科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the traditional industrial flue gas purification process is to denitrate the flue gas at 315°C-400°C after passing through the heat exchanger, and then perform dust removal at 120-160°C after denitrification. The gas purification process is long, the system is complex, and the floor area is large. , the treatment cost is high, and the flue gas is not dedusted before denitrification, the alkali metal in the dust will have a poisonous effect on the denitrification catalyst, reducing the denitrification efficiency and service life of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A multifunctional composite gas purification membrane material, comprising a membrane layer and a substrate. The membrane layer is a biaxially stretched polytetrafluoroethylene membrane. The substrate is made of a mixture of carrier fibers and low-temperature denitrification catalytic fibers. The carrier fiber accounts for 40% by weight. The carrier fiber is a mixed material of organic fiber and inorganic fiber, in which the content of inorganic fiber is 10wt%, the low-temperature denitrification catalytic fiber has a bead structure, the diameter of the bead is 0.1μm, and the catalytic active component is TiO 2 The content is 20wt%, Mn content is 15wt%, Cr content is 3wt%, V content is 20wt%, Sn content is 1wt%, Ce content is 0.5t%, and Cu content is 0.5wt%.

[0018] The membrane layer has an average pore diameter of 0.5 μm, a thickness of 30 μm, and a porosity of 80-95%. The substrate has an average pore diameter of 30 μm, a thickness of 3 mm and a porosity of 70%. The memb...

Embodiment 2

[0026] A multifunctional composite gas purification membrane material, comprising a membrane layer and a substrate. The membrane layer is a biaxially stretched polytetrafluoroethylene membrane. The substrate is made of a mixture of carrier fibers and low-temperature denitrification catalytic fibers. The carrier fiber accounts for 50wt% The carrier fiber is a mixed material of organic fiber and inorganic fiber, in which the content of inorganic fiber accounts for 20wt%. The low-temperature denitrification catalytic fiber has a bead structure, the diameter of the bead is 2μm, and the catalytically active component is TiO 2 The content is 40wt%, Mn content is 10wt%, Cr content is 5wt%, V content is 15wt%, Sn content is 5wt%, Ce content is 1.5wt%, and Cu content is 1wt%.

[0027] The membrane layer has an average pore diameter of 10 μm, a thickness of 15 μm, and a porosity of 90%. The substrate has an average pore diameter of 15 μm, a thickness of 5 mm and a porosity of 80%. The membra...

Embodiment 3

[0035] A multifunctional composite gas purification membrane material, comprising a membrane layer and a substrate. The membrane layer is a biaxially stretched polytetrafluoroethylene membrane. The substrate is made of a mixture of carrier fibers and low-temperature denitrification catalytic fibers. The carrier fiber accounts for 70wt% , The carrier fiber is a mixed material of organic fiber and inorganic fiber, in which the content of inorganic fiber is 30wt%, the low-temperature denitration catalytic fiber has a bead structure, the diameter of the bead is 3μm, and the catalytic active component is TiO 2 The content is 50wt%, Mn content is 5wt%, Cr content is 10wt%, V content is 10wt%, Sn content is 10wt%, Ce content is 2wt%, and Cu content is 2wt%.

[0036] The membrane layer has an average pore diameter of 15 μm, a thickness of 30 μm, and a porosity of 95%. The substrate has an average pore diameter of 30 μm, a thickness of 10 mm and a porosity of 95%. The membrane layer and the...

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Abstract

A multifunctional composite gas purification membrane material, including a membrane layer and a substrate. The membrane layer is a biaxially stretched polytetrafluoroethylene membrane. The substrate is made of a mixture of carrier fiber and low-temperature denitration catalytic fiber. The carrier fiber accounts for 40‑ 70wt%, the carrier fiber is a mixed material of organic fiber and inorganic fiber, in which the inorganic fiber content accounts for 10-30wt%, the low-temperature denitration catalytic fiber has a bead structure, the bead diameter is 0.1-3μm, and the catalytic active component is TiO 2 Content 20‑50wt%, Mn content 5‑15wt%, Cr content 3‑10wt%, V content 10‑20wt%, Sn content 1‑10wt%, Ce content 0.5‑2wt%, Cu content 0.5‑2wt%. Both dust removal and denitrification operate at 120-160°C. Coupling dust removal and denitrification shortens the exhaust gas purification process, reduces the size of the exhaust gas purification equipment, and improves the heat recovery and utilization efficiency in the exhaust gas.

Description

Technical field [0001] The invention belongs to the technical field of gas purification, and specifically relates to a multifunctional composite gas purification membrane material with denitration and dust removal functions. [0002] technical background [0003] At present, my country's atmospheric environment is very severe, with frequent occurrence of large-scale smog and air pollution characterized by fine particulate dust and nitrogen oxides, which has caused great harm to human health and environmental quality. In recent years, a lot of research work has been done on gas dust removal and flue gas denitrification. Among the many gas dust removal technologies, membrane dust removal technology has the advantages of high dust removal efficiency, low pressure drop loss, and long service life, and has become the mainstream dust removal technology on the market. For nitrogen oxide removal, the current main methods are SCR and SNCR. The reaction temperature of SCR is 315-400℃, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36B01D69/12B01D46/54B01D53/90B01D53/56B01J23/889B01J35/06
CPCB01D46/543B01D53/8628B01D53/90B01D69/12B01D71/36B01J23/8892B01D2325/10B01J35/58
Inventor 罗玉湘
Owner 南京科赫科技有限公司
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