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Preparation method of a dual-function ceramic filter for denitrification and dust removal

A ceramic filter, denitration and dust removal technology, which is applied in chemical instruments and methods, separation methods, dispersed particle filtration, etc., can solve problems such as difficulty in achieving uniform dispersion of SCR catalysts, increasing the preparation cost of catalytic ceramic filters, and easy falling off of SCR catalysts. , to achieve the effect of improving the SCR denitration activity, increasing the active specific surface, and reducing the amount of raw materials

Active Publication Date: 2018-04-03
NANJING WEIHENG EXPERIMENTAL EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although the catalytic ceramic desulfurizers prepared by these methods have also achieved some good denitrification and dust removal effects, they still face the following problems: (1) It is difficult to achieve SCR catalysts on ceramics regardless of the method of organometallic precursor impregnation or sol coating. Uniform dispersion inside the filter pores; (2) The ceramic filter material and firing temperature are significantly different from the SCR catalyst, resulting in the loaded SCR catalyst being easy to fall off or aggregate during the back-blowing regeneration process; (3) SCR in the ceramic filter The uneven dispersion inside the pores of the device will inevitably reduce its SCR catalytic activity. In order to ensure the activity, the loading of V and W must be increased, which increases the preparation cost of the catalytic ceramic filter; (4) the aggregation of the loaded SCR catalyst will also Causes plugging of ceramic filter bores, increasing pressure drop and operating costs

Method used

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  • Preparation method of a dual-function ceramic filter for denitrification and dust removal
  • Preparation method of a dual-function ceramic filter for denitrification and dust removal
  • Preparation method of a dual-function ceramic filter for denitrification and dust removal

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Weigh 10g titanyl sulfate, 0.5g PVP, 0.2g hydroxycellulose, dissolve into 500mL pure water to form a uniformly dispersed solution; take a 10cm ceramic filter with an outer diameter of 60cm and an inner diameter of 40cm (such as figure 2 Shown) soak in the above solution, vacuumize the solution to fully enter the pores of the ceramic filter, adjust the pH of the solution to 8 with 10% ammonia water, and react in a shaker at 60° C. for 1 hour, take it out, wash it, and dry it. The dried samples were calcined in a muffle furnace at 400° C. for 2 h.

[0053] Another 2g NH 4 VO 3 and 4g[(NH 4 ) 6 W 12 o 39 ·H 2 O] dissolved in 300mL pure water, the loaded TiO 2 The ceramic filter of the film is immersed in the above solution, the pH is adjusted to 8.5, washed, dried, and baked at 500°C for 4 hours to obtain a dual-function ceramic filter for denitration and dust removal. The results of the SCR catalyst ultra-thin film loaded on the ceramic filter are as follows: im...

Embodiment 2

[0056] Weigh 8g tetrabutyl titanate, 0.5g polyvinyl alcohol, dissolve into 450mL ethanol and 50mL pure water to form a uniformly dispersed solution; take a 10cm ceramic filter with an outer diameter of 60cm and an inner diameter of 40cm and soak it in the above solution, pump Vacuum the solution to fully enter the pores of the ceramic filter, react in a shaker at 30°C for 10 hours, take it out, wash it, and dry it. The dried samples were calcined in a muffle furnace at 400° C. for 2 h.

[0057] Another 1.5g of vanadium acetylacetonate and 3g of tungsten chloride were dissolved in 300mL of ethanol, and the loaded TiO2 The thin-film ceramic filter is immersed in the above solution, dried, and fired at 500°C for 4 hours to obtain a dual-function ceramic filter for denitrification and dust removal.

[0058] After testing, the filtration efficiency of the catalytic ceramic filter is 99.5%. 3 When the / NOx ratio is 0.8, the maximum conversion rate of NOx is 80% of the limit convers...

Embodiment 3

[0060] Weigh 15g of titanium tetrachloride, 0.5g of PVP, and 1g of sodium sulfate, and dissolve them in 500mL of ethanol to form a uniformly dispersed solution; soak a 10cm ceramic filter with an outer diameter of 60cm and an inner diameter of 40cm in the above solution, and vacuumize the solution Fully enter the pores of the ceramic filter, place it in a reaction kettle and react at 200°C for 10 hours, take it out, wash it, and dry it. The dried samples were calcined in a muffle furnace at 400° C. for 2 h.

[0061] Another 2g NH 4 VO 3 and 4g[(NH 4 ) 6 W 12 o 39 ·H 2 O] dissolved in 300mL pure water, the loaded TiO 2 The thin-film ceramic filter is immersed in the above solution, and subjected to hydrothermal reaction at 250°C for 10h. Washing, drying, and sintering at 500°C for 4 hours to obtain a dual-function ceramic filter for denitrification and dust removal.

[0062] After testing, the filtration efficiency of the catalytic ceramic filter is 99.96%. 3 When the...

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Abstract

The invention relates to a denitration and dedusting difunctional ceramic filter, and a preparation method and an application thereof. The preparation method of the denitration and dedusting difunctional ceramic filter includes the following steps: (1) with a titanium salt solution as a precursor, growing a TiO2 ultra-thin film in ceramic filter pores in situ by a precipitation method; and (2) loading the TiO2 ultra-thin film obtained in the step (1) with vanadium and tungsten, and thus obtaining the denitration and dedusting difunctional ceramic filter. The SCR denitration catalyst ultra-thin film is precipitated and grown in situ in the ceramic filter pores, is uniformly dispersed in nanometer scale, has adjustable thickness, and is firmly combined with a ceramic filter substrate; the prepared catalytic ceramic filter enables the NOx conversion rate to reach 80% of the limiting conversion rate and the ammonia escape rate to be less than 5 ppm with the NH3 / NOx ratio of 0.8 and in a wide temperature range of 180-420 DEG C; and at the same time, under the same pressure drop condition with an original filter, the catalytic ceramic filter can have the dust removal efficiency reaching more than or equal to 99%.

Description

technical field [0001] The invention belongs to the field of dedusting and purifying industrial flue gas, and in particular relates to a preparation method of a dual-function ceramic filter for denitrification and dedusting. Background technique [0002] my country is a big coal country, and the extensive use of industrial coal-fired boilers emits a large amount of industrial waste gas. Among them, nitrogen oxides (NO X ) is one of the main air pollutants that cause a series of problems such as acid rain and photochemical smog that damage the earth's ecological environment, and is also a key and difficult point in the current atmospheric environmental protection. Dust removal and purification is another important aspect of flue gas treatment, and it is also the top priority to control the current large-scale and high-frequency smog in China. Therefore, the denitrification and dust removal of industrial flue gas is of great significance to the prevention and control of air ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01D53/88B01D53/56B01D46/54B01J23/30
CPCB01D46/543B01D53/8628B01D53/8631B01D53/88B01D53/90B01D2255/20707B01D2255/20723B01D2255/20776B01D2257/404B01D2258/0283B01J23/002B01J23/30B01J2523/00B01J2523/47B01J2523/55B01J2523/69
Inventor 余剑李长明唐诗白张建岭
Owner NANJING WEIHENG EXPERIMENTAL EQUIP CO LTD
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