42results about How to "Low shot content" patented technology

The present invention relates to a method of making mounting mats for use in pollution control device. The method comprises the steps of: (i) supplying inorganic fibers through an inlet of a forming box having an open bottom positioned over a forming wire to form a mat of fibers on the forming wire, the forming box having a plurality of fiber separating rollers provided in at least one row in the housing between the inlet and housing bottom for breaking apart clumps of fibers and an endless belt screen; (ii) capturing clumps of fibers on a lower run of the endless belt beneath fiber separating rollers and above the forming wire; (iii) conveying captured clumps of fibers on the endless belt above fiber separating rollers to enable captured clumps to release from the belt and to contact and be broken apart by the rollers; (iv) transporting the mat of fibers out of the forming box by the forming wire; and (v) compressing the mat of fibers and restraining the mat of fibers in its compressed state thereby obtaining a mounting mat having a desired thickness suitable for mounting a pollution control element in the housing of a catalytic converter.

The invention discloses a production system and a production method of microfiber glass wool. The production system includes a melting kiln, a fuel gas source, a first blower, a wire drawing bushing, a cotton blowing device, a second blower, a cotton receiving device and The controller; the production method comprises the following steps: (1) heating and melting; (2) wire drawing; (3) blowing cotton. Beneficial effects: the present invention has a simple structure, is easy to implement, and realizes the automatic control function, which ensures the stability of the glass wool beating degree, thereby ensuring the stable quality of the produced glass wool; and ensuring the stable pressure of the flame air flow blown out by it. , thereby reducing the content of slag balls in the product glass wool, improving the quality of glass wool; reducing the use of fuel gas, reducing power consumption, and reducing production costs.

The invention discloses a pure oxygen combustion system for rock wool melt temperature multi-point accuracy control, and solves the technical problems that in the conventional rock wool production process, the melting strength of a product is insufficient, the acidity coefficient is high, and the melt is cooled through chute combining. The pure oxygen combustion system is characterized in that natural gas is used as fuel; oxygen is adopted as a combustion-supporting medium; rock wool melt is heated through combustion of pure oxygen combustion guns; the particular positions, acting on the rock wool melt, of the pure oxygen combustion guns are the top part of a siphonal opening, the lower part of a No. 1 movable chute and the lower part of a No. 2 movable chute; the real-time multi-point accuracy control of natural gas or oxygen flow rate is realized through real-time on-line measurement of the multi-point temperatures of the rock wool melt, so that the process temperature needed by the rock wool melt can be accurately controlled. According to the pure oxygen combustion system, stable production of rock wool product with high acidity coefficient can be realized, the fiber forming rate of rock wool melt can be increased, energy consumption in rock wool melt melting process can be effectively lowered, and the shot content of the product can be reduced.

The invention discloses an inorganic fiber with coal ash as a main raw material and a manufacturing method of the inorganic fiber. A residue obtained after the inorganic fiber taking the coal ash as the main raw material is fired at the temperature of 550 DEG C for 30min contains the following components in percentage by weight: 39.0-48.0% of SiO2, 10.0-20.0% of Al2O3, 20.0-28.0% of CaO, 2.5-10.5% of Fe2O3, 3.5-10.5% of MgO, 0.2-2% of Na2O, 0.2-2.0% of K2O and 0.2-2.5% of TiO2. The inorganic fiber disclosed by the invention has favorable water resistance and durability, a relatively high acidity coefficient, relatively low shot content, a relatively small fiber diameter, very high tensile strength and a relatively low heat conductivity coefficient, can be used as a sound absorption material, a thermal insulation material and the like and can be used for completely replacing a rock wool board thermal insulation material made of a basalt fiber in the prior art.

The invention discloses a production process of an environmentally friendly rock wool insulation board. Preheating is carried out after mixing and crushing raw materials, and then the temperature in the cupola is maintained, and liquid oxygen is added when the raw materials are melted and burned, so that the production does not require too high heating temperature , reduces production requirements, saves energy, and has a reasonable ratio to ensure that the obtained molten raw material liquid has a uniform composition. Reduce the generation of slag balls; the production process uses raw material crushing equipment for raw material crushing, cutting and crushing the mixture through high-speed rotating crushing rollers, and screening the powder with small particle size through the sieving plate to discharge, so that the obtained mixed raw materials have high uniformity and mixing The effect is good, which reduces the difficulty of the subsequent heating and melting and material fiberization process, further makes it easy to reach the production temperature of the environmental protection rock wool insulation board, and reduces the content of slag balls in the environmental protection rock wool insulation board.

The invention belongs to the technical field of refractory materials, and in particular relates to an alumina fiber blanket and a preparation method thereof. The preparation method provided by the present invention comprises the following steps: a) mixing and heating polyaluminum chloride sol, silica sol and spinning aids for reaction to obtain spinning dope; the spinning aids include lactic acid, polyvinyl alcohol and alcohol; b) The spinning stock solution is fiber-formed in a spinning machine, and the obtained fiber filaments are collected to obtain a precursor fiber blank; the distance between two adjacent rows of orifice plates in the spinning machine is ≥ 5 mm, and the same row of orifice plates The distance between the spinning holes on the upper surface is ≥ 2.5mm; c) Needling the precursor fiber blank to obtain the precursor fiber blanket; d) Carrying out the precursor fiber blanket in the low temperature zone, medium temperature zone and high temperature zone of the heating furnace in sequence Heat treatment to obtain alumina fiber blanket. The alumina fiber blanket prepared by the method of the invention has high integrity and low slag content, and is suitable for use as a surface protection material for ceramic fiber module furnace linings.

The invention relates to a slag-free aluminum silicate cotton wool and its application in the braking field. Contains ordinary type, zirconium-containing type and soluble aluminum silicate fiber lint, the fiber length is 50-300μm±30, the diameter is 2-5μm, the slag content of φ≥0.25mm is 0-8%, and the Mohs hardness is 5-7 , use temperature 1000~1300℃, thermal conductivity W / mk, 500±20℃≤0.153, tensile strength 1000~1600Mpa; chemical composition is Al2O343~55%, SiO245~57%; or Al2O3+SiO2+ZrO298.5~ 99.5%, of which, ZrO2≥15%, impurity balance; or SiO2 52~85%, CaO 5~35%, MgO 1~10%, Al2O30~1%, B2O31~2%; used as fiber reinforcement in the braking field material application.

The invention discloses a production method of centrifugal super-filament slag cotton with excellent index and long fiber: (1) raw material preparation: blast furnace slag, basalt, fly ash, magnesium oxide, calcium oxide, silica fume (2) Fiber preparation: The liquid mixture is continuously flowed into the high-speed rotating centrifugal roller, and the liquid mixture is condensed into silky fibers under the action of centrifugal throwing and air cooling. The fiber filaments are collected and formed under the action of the blast, and the (1) raw material components are calculated by weight percentage: 55-65% of blast furnace slag, 12-18% of basalt, 5%-7% of fly ash, 2% of magnesium oxide %‑3%, calcium oxide 2%, wollastonite 15%‑20%.