Plugging device and method for wall-flow honeycomb filter
A filter and wall-flow technology, applied in chemical instruments and methods, separation methods, filtration and separation, etc., can solve the problems of high quality honeycomb filter, avoid transportation waste, avoid wet billet deformation, and easy plugging method Effect
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Embodiment 1
[0057] Example 1 Preparation of honeycomb filter body 1#
[0058] The preparation method of the honeycomb filter includes mixing raw materials, mud refining, forming, plugging and microwave drying to obtain the honeycomb filter. The honeycomb filter is cylindrical and has a checkerboard plugging structure with square cross-section gas channel openings. The preparation method of concrete honeycomb filter body 1# comprises the following steps:
[0059] 1) Preparation of clay: Mix 100g of ceramic raw materials that can be fired into cordierite honeycomb ceramics, 6g of binder, 15g of pore-forming agent and 2g of lubricant in a coulter, and the mixed mud is kneaded or smelted Made into clay; the raw material of ceramic clay can be a mixture of talc, kaolin, calcined kaolin, alumina, aluminum hydroxide, boehmite and silicon oxide that can be made into cordierite; the binder can be selected from hydroxypropyl methylcellulose ; The pore-forming material is made of potato starch; the...
Embodiment 2
[0064] Preparation of embodiment 2 honeycomb filter body 2#-7# and contrast honeycomb filter body 1#-4#
[0065] According to the preparation method of Example 1, honeycomb filter body 2#, honeycomb filter body 3#, and honeycomb filter body 4 were prepared respectively by using different injection speeds, plugging depths, and the ratio of the outlet hydraulic diameter of the injection gun to the hydraulic diameter of the gas passage opening. #, honeycomb filter 5#, honeycomb filter 6#, honeycomb filter 7#, comparison honeycomb filter 1#, comparison honeycomb filter 2#, comparison honeycomb filter 3# and comparison honeycomb filter 4#. The specific parameters are shown in Table 1.
[0066] Table 1
[0067] Injection speed / mm / min Plugging depth / mm hydraulic diameter ratio Honeycomb filter 1# 7 7 0.99 Honeycomb filter 2# 5 6 0.99 Honeycomb filter 3# 10 8 0.99 Honeycomb filter 4# 6 7 0.99 Honeycomb filter 5# 8 7 0.99 Ho...
Embodiment 3
[0068] Preparation performance test of embodiment 3 honeycomb filter body 1#-7# and comparison honeycomb filter body 1#-4#
[0069] The plugging conditions of the honeycomb filter bodies 1#-7# prepared in Examples 1 and 2, and the comparison honeycomb filter body 1#-4#: check whether the plugging is not strict, whether there is cracking, and test the back pressure , and the test results are shown in Table 2. The plugging condition inspection adopts light inspection, put the honeycomb ceramic filter body on the light, and rely on naked eyes to identify it. If the plugging hole of the honeycomb ceramic body is intact, there will be no light leakage; if the hole plugging is not tight or cracked, light leakage will occur . Test back pressure If the back pressure is less than or equal to 3.2KPa, it is considered qualified; if the back pressure is greater than 3.2KPa, it is considered unqualified.
[0070] Table 2
[0071] Plugging condition back pressure evaluate...
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Abstract
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