Porous ceramic for flue gas filtration as well as preparation method and application thereof

A technology of porous ceramics and flue gas, which is applied in the field of porous ceramics, can solve the problems of increasing equipment cost due to energy consumption, expanding equipment footprint, and deactivation of catalysts, so as to save equipment costs and operating costs, solve attenuation and failure, and prepare The effect of simple method

Inactive Publication Date: 2021-04-02
JIANGSU FILTERTEX FILTER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the flue gas is easy to block the porous material and cause the catalyst to lose its activity, the industrial flue gas treatment usually first removes dust and then denitrates, and the treated gas after dust removal and cooling needs to be heated again for denitrification treatment, resulting in a large amount of energy consumption and increased equipment. cost, while step-by-step processing also reduces processing efficiency and expands the equipment footprint

Method used

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  • Porous ceramic for flue gas filtration as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A method for preparing porous ceramics for flue gas filtration, said method comprising steps as follows:

[0027] Prepare the following ceramic raw materials: 80g silicon carbide, 10g bentonite, 8g Suzhou soil, 3g potassium feldspar, 2g spodumene, 35g graphite and 2g sodium tripolyphosphate. The aggregate and pore-forming agent are pre-screened to obtain a median particle size of silicon carbide of 150-200 μm and a median particle size of graphite of 50-70 μm. Put the above-mentioned ceramic raw materials into a ball mill, use deionized water as a ball milling medium, and obtain a ceramic slurry after ball milling for 24 hours. Put the ceramic slurry into a mold after drying, and perform isostatic pressing under a pressure of 10 MPa to obtain a ceramic green body. In an oxygen atmosphere, the ceramic green body is heated up to 260°C at a heating rate of 1-2°C / min, kept for 1 hour, then raised to 840°C at a heating rate of 2-3°C / min, kept for 2 hours, and finally heated...

Embodiment 2

[0029] A method for preparing porous ceramics for flue gas filtration, said method comprising steps as follows:

[0030] Prepare the following ceramic raw materials: 85g aluminum silicate fiber, 6g bauxite, 3g Fangzi soil, 7g Suzhou soil, 3g potassium feldspar, 5g calcium oxide, 40g charcoal and 3g polyvinyl alcohol. The aggregate and pore-forming agent are pre-screened to obtain an aspect ratio of aluminum silicate fibers of 35:1, and a median particle size of charcoal of 50-70 μm. Put the above-mentioned ceramic raw materials into a ball mill, use deionized water as a ball milling medium, and obtain a ceramic slurry after ball milling for 24 hours. Put the ceramic slurry into a mold after drying, and perform isostatic pressing under a pressure of 15 MPa to obtain a ceramic green body. In an oxygen atmosphere, the ceramic green body was heated to 200°C at a heating rate of 1-2°C / min, kept for 2 hours, then raised to 850°C at a heating rate of 2-3°C / min, kept for 1.5 hours, a...

Embodiment 3

[0032] A method for preparing porous ceramics for flue gas filtration, said method comprising steps as follows:

[0033] Prepare the following ceramic raw materials: 90g mullite, 6g bauxite, 14g Zhangcun soil, 5g calcite, 5g talc, 40g charcoal and 3g thermosetting resin. The aggregate and the pore-forming agent are pre-screened, so that the median particle size of the mullite is 150-200 μm, and the median particle size of the charcoal is 50-70 μm. Put the above-mentioned ceramic raw materials into a ball mill, use deionized water as a ball milling medium, and obtain a ceramic slurry after ball milling for 24 hours. Put the ceramic slurry into a mold after drying, and perform isostatic pressing under a pressure of 20 MPa to obtain a ceramic green body. In an oxygen atmosphere, the ceramic green body is heated to 300°C at a heating rate of 1-2°C / min, kept for 1 hour, then raised to 900°C at a heating rate of 2-3°C / min, kept for 1 hour, and finally heated at a temperature of 1-3...

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Abstract

The invention discloses a porous ceramic for flue gas filtration as well as a preparation method and application of the porous ceramic, and belongs to the technical field of porous ceramics. The method comprises the steps of taking the following components in parts by weight: 80-90 parts of aggregate, 20-30 parts of a high-temperature binding agent, 35-40 parts of a pore-forming agent and 2-3 parts of a forming aid, wherein aggregate is silicon carbide, aluminum silicate fibers or mullite, the high-temperature binding agent comprises clay and a fluxing agent, and the mass ratio of the clay tothe fluxing agent is (2-4): 1; uniformly mixing the aggregate, the high-temperature binding agent, the pore-forming agent and the forming aid through ball milling, pressing into a biscuit through isostatic pressing, and finally, sintering to obtain the porous ceramic. The porous ceramic has the characteristics of high temperature resistance, acid and alkali resistance, high porosity and high mechanical strength, has filtration and catalysis performance after being loaded with a denitration catalyst, and can effectively realize a dust removal and denitration integrated function.

Description

technical field [0001] The invention belongs to the technical field of porous ceramics, and in particular relates to a porous ceramic for flue gas filtration, a preparation method and application thereof. 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 pollution in our cou...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622C04B38/06B01D53/86
CPCC04B38/068C04B35/565C04B35/622B01D53/8625C04B2235/3472C04B2235/349C04B2235/447C04B2235/6562C04B2235/6567C04B2235/661C04B2235/6022
Inventor王润黎杜建周邱龙李坤潮彭水军王艺月
OwnerJIANGSU FILTERTEX FILTER MATERIAL