Temperature has a major effect on the calcination overall performance of limestone in a wide vary. Calcination experiments of limestone with particle sizes of 150 μm are conducted at temperatures from 750 to 920 °C less than N2 environment in MFB-TGA apparatus. The model results are as opposed Along with the experimental info of MFB-TGA at numerous temperatures revealed in Determine 2a. The conversion of limestone particles raises speedily from Original to complete conversion with time, Specifically at superior temperature. Below 900 °C, it only takes ~10 s for particle conversion to accomplish ~a hundred%.
A fascinating position is always that since the partial pressure of CO2 increases, the result of particle dimensions decreases. In the investigated temperature assortment, the particle intake is managed by both the chemical reaction and gasoline diffusion. The outcome of particle measurement on limestone calcination kinetics provides a few-zone characteristics from the reaction controlling system. In Zone I, the particle dimension is ~450 μm, the calcination course of action is mainly controlled by gasoline diffusion, along with the impact of particle dimensions is critical. In Zone II, while in the particle size array of eighty–450 μm, the calcination is managed by both of those gas diffusion and chemical reaction. The design prediction effects are in good arrangement While using the experimental info, indicating the experimental final results and the calcination model will provide valuable info for the application of CaL technological innovation.
A managed shut technique with exactly defined problems similar to this is essential to obtain unambiguous information and facts and top quality outcomes.
กด “ถัดไป” จากนั้น กรอกข้อมูล ซึ่งสำคัญอยากมาก ชื่อ บัญชีธนาคารต้องตรงกัน (ธนาคารอะไรก็ได้ในไทย).
Furthermore, the blend of gas species has an effect on the first sign and brings about problems when you can find versions inside the concentration of numerous constituent gases within the experiment. (iii) Tube furnace [38] and large-temperature gasoline–sound suspension furnace [39,40]; the particle heating fee is speedy, though the sample sizing is scaled-down than ~70 μm, along with the residence time is shorter than 5 s. Concurrently, the gasoline and particles Within the drop tube furnace are in entrained stream, although the gas In the fluidized bed is split right into a bubble stage and an emulsion phase. The particles Within the fluidized mattress will kind a dense section. For that reason, the calcination kinetics attained from drop tube furnace can not be correctly applied for the development of the fluidized mattress reactor. (iv) In situ XRD technique [32]; the adjust in crystal composition of CaCO3 particles during calcination is analyzed making use of X-ray diffraction, which can be coupled with TGA to obtain in situ particle conversion.
แชร์ให้เพือน ๆ ได้รู้จักกับเรา พร้อมใส่รหัสแน่นำของคุณ
สัญลักษณ์ ละครสัตว์ มีอัตราจ่ายสูงสุด x60 เท่า
The calculations on compound stoichiometry can be achieved at any temperature Considering that the TG curve is a quantitative equation.
The decomposition technique of calcium carbonate is a standard gas–strong area reaction. In combination with chemical surface area reactions, the diffusion of CO2 in the porous CaO layer and across the particles really should be regarded as from the created design to replicate the impact of CO2 focus. Therefore, in the following derivation, we think the area reaction of spherical calcium carbonate particles takes place with the shrinking Main model, along with the product of intraparticle and external diffusion procedures of CO2 is established.
Quasistatic thermogravimetry: In this kind of Investigation, the sample is heated to regular excess weight at raising temperature.
The calcination experiments of limestone are carried out in the microfluidized mattress thermogravimetric Investigation (MFB-TGA) equipment, as revealed in Determine 9a, which consisted of the quartz reactor, An electrical furnace, a fuel source system, along with a measurement technique [forty six]. The quartz reactor is built to certainly be a fluidized bed with the internal diameter of 28 mm, the inner diameter of the highest sample inlet of 10 mm, plus a porous distribution plate with a thickness of 5 mm for making the air flow evenly to the reactor. The fuel provide process includes mass stream controllers calibrated that has a cleaning soap bubble flowmeter previous to the experiment, solenoid valves, and gasoline cylinders. Through the use of a sufficiently skinny silicone hose to connect the reactor and also the inlet pipe, difficult connections may be avoided and interference with the quality sign is often removed.
Name your assortment: Title needs to be under one hundred people Choose a collection: Unable to load your collection because of an error
ของเรา พร้อมพัฒนาให้คุณได้สัมผัสมาตรฐานใหม่อยู่เสมอ หมดปัญหาทิ้งเว็บ ทิ้งผู้เล่น เราพัฒนาได้จริงจังเพื่อเป็นมาตรฐานความปลอดภัยและบริการที่ดีที่สุด
The chemical reaction rate, internal diffusion price and external diffusion price in the particles are comprehensively deemed to find out website the suitable running temperature and particle dimensions.