How to determine the actual production capacity of a rotary kiln, and what causes material discharge issues? Urgent, urgent, urgent.
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How is the actual production capacity of a rotary kiln determined? If the inclination angle and rotation speed are constant, then the time the material spends inside the kiln is also constant, right? So how can we determine the actual maximum production capacity? The manufacturer said that the values listed in the manual are also theoretical values, and there is a range involved. Additionally, the manufacturers currently keep the cleaning plug valve at the feed end open, which causes material to leak out from that valve whenever the vibratory feeder is fed. During the production process, is this plug valve always open? If material leaks out, does that mean the amount of material added is too large? But I think the amount added is too small. It is reversely heated.
This post was last edited by smcb on 2009-9-19 08:44. For assessing the production capacity of rotary kilns, the Japanese T-14 report or empirical formulas derived from actual production data of rotary kilns by institutions such as Nanjing University of Chemical Technology can be used; however, these formulas were developed based on production data from the 1970s and 1980s, and they are no longer suitable for the conditions that have arisen following the significant technological advancements in precalcination kilns since the 1990s. Significant improvements and advancements have been made in the cylinders, tubes, furnaces, kilns, machinery of pre-decomposition kiln systems, as well as in fuel burners, heat-resistant, fire-resistant, and insulating materials, and in operational control capabilities. For example, new types of cyclones, new types of decomposition furnaces, third-generation control-flow paddle coolers, and PYROMPID short kilns have further improved and optimized the operating conditions of pre-decomposition kilns. Since factors such as the type of pre-decomposition kiln, associated equipment, conditions of raw materials and fuels, and the fuel-to-kiln ratio vary greatly, it is difficult to develop a formula that can be used to calculate the production capacity of pre-decomposition kilns in all possible situations. However, it is still feasible to assess the production capacity of rotary kilns by comparing their unit production capacity with relevant kiln parameters, including unit effective volume, effective internal surface area, and the production capacity based on the effective cross-sectional area of the firing zone. Download this and take a look; it uses relevant data to assess the production capacity of rotary kilns
The time the material spends in the kiln is related to the inclination angle, rotation speed, and kiln diameter； With a constant inclination and constant rotational speed, the time that the material stays in the kiln is also constant. I think the amount of additive can be determined based on time.
Production volume is related to the factors you mentioned, as well as the requirements of your product and the initial conditions and final requirements. It is the result of the actual equipment setup in practical production, and it is not an issue that can be discussed in isolation.
Thank you all so much. My kiln is small and simple; it’s used for the chemical calcination of materials, with reverse heating. Its dimensions are 1.3*15 meters, and it doesn’t have any complex additional devices. The diameter and inclination angle are fixed, as is the rotation speed (which means the time required for the materials to be heated is constant). How can I increase the production volume? Or rather, how can I determine the maximum production capacity of this kiln? It always seems that the output is too low. When starting the trial production of the calcined samples, only one batch of material was fed at a time. After the samples passed the quality checks, production resumed with continuous feeding. Using the same feeding rate as before, leakage started to occur at the material discharge plug valve; the situation improved only when the feeding rate was reduced, and the leakage decreased, though the amount of material fed still seemed too small. Please, experts, continue to provide guidance. Thank you very much.
——“\"With a constant inclination and constant rotational speed, the time the material spends inside the kiln is also constant.\" In general terms: basically correct. In fact, the residence time can be adjusted through the facilities inside the kiln; for example, adding retaining rings or adjusting their height can both increase the production capacity of the rotary kiln by altering the residence time!
The problem LZ is facing is a practical one that should be solved through practice. Do more tests. 1. The feeding light is on now; is the product qualified? If it meets the requirements, the feed is increased and the cleaning plug valve can be closed. At this stage, the main focus is on testing the kiln’s capacity until defective products appear. That is, the maximum capacity has been found. 2. Adjust other supporting equipment such as the feeding dragon, etc. 3. If you feel your capabilities are limited, you can make adjustments from two aspects: one is the process parameters, such as feed temperature, particle size, heating temperature, and discharge temperature. Instead, it involves adjusting the inclination and rotation speed of the kiln at the equipment level, as well as adding stirring plates inside. 4. All adjustments have certain limits; know when to stop.