Method for adjusting grouting parameters in preparation of ceramic composite fiber-based catalytic filter tube, and method and device for preparing ceramic composite fiber-based catalytic filter tube

A preparation method of a ceramic composite fiber-based catalytic filter tube, comprising the following steps:

• step S1, conducting pretreatment on a fiber to obtain a required slurry;
• step S2, injecting the slurry into a mold of a ceramic composite fiber-based filter tube through a pressure grouting port above the mold to obtain a blank tube of the ceramic composite fiber-based filter tube;
• step S3, controlling to close a first electromagnetic valve provided above the pressure grouting port with a central control unit, and controlling a vacuum pump to conduct suction on the blank tube of the ceramic composite fiber-based filter tube by the central control unit to obtain a shaped blank tube of the ceramic composite fiber-based filter tube;
• step S4, placing the shaped blank tube of the ceramic composite fiber-based filter tube into a sol of a catalyst, and conducting immersing, air-drying, drying, and sintering under vacuum conditions to obtain a ceramic composite fiber-based filter tube with a catalytic function;
• wherein the catalyst comprises the following components in percentage by weight:
• 0.5% to 1.5% of platinum, 2% to 5% of vanadium pentoxide, 1% to 3% of rare earth, 0.2% to 0.5% of titanium dioxide, 0.2% to 0.6% of thiourea, 0.1% to 0.5% of a dispersant, and 90% to 93.4% of pure water;
• and
• step S5, drying the ceramic composite fiber-based filter tube with a catalytic function in a drying room to obtain the ceramic composite fiber-based catalytic filter tube;
• wherein
• in step S2, the preparation method further comprises:
• before grouting, inputting a fiber length, a pH value, and a solid phase content of a slurry into a central control unit in advance;
• determining a loading reference value of the slurry by the central control unit according to the fiber length, the pH value, and the solid phase content of the slurry;
• and determining a grouting pressure and a grouting pressure holding time of a grouting unit that is arranged on a left side of the mold and connected to a pressure grouting port, as well as a suction pressure and a suction time of the vacuum pump that is arranged below the mold;
• when determining the grouting pressure of the grouting unit and conducting operation to the grouting pressure holding time by the central control unit, determining whether it is necessary to adjust the grouting pressure holding time by the central control unit according to a real-time grouting amount and a preset grouting amount transmitted by a grouting meter;
• if yes, extending the grouting pressure holding time to varying degrees by the central control unit according to a difference range between the real-time grouting amount and the preset grouting amount;
• and
• when conducting operation according to a determined grouting pressure to the grouting pressure holding time or an adjusted grouting pressure holding time with the grouting unit, controlling the first electromagnetic valve to close with the central control unit;
• when controlling the vacuum pump to conduct operation to half of the suction time by the central control unit according to a determined suction pressure, receiving an ultrasonic thickness gauge that is arranged on a right side of the mold by the central control unit, to detect a thickness of a blank tube of a ceramic composite fiber-based filter tube;
• and comparing an actual thickness of the blank tube with a gap inside the mold by the central control unit, adjusting the suction pressure of the vacuum pump according to different results of the comparison, and then conducting operation to the suction time according to an adjusted suction pressure of the vacuum pump;
• after completing a first ceramic composite fiber-based filter tube, comparing a porosity of the prepared ceramic composite fiber-based filter tube with that of a ceramic composite fiber-based filter tube to be prepared by the central control unit, and adjusting the grouting pressure according to a comparison result for preparing a same type of the ceramic composite fiber-based filter tube next time;
• and
• when preparing the same type of the ceramic composite fiber-based filter tube next time, readjusting the grouting pressure determined according to the loading reference value after the adjustment next time, and conducting operation with an adjusted grouting pressure.