A one-dimensional mathematical model is presented for a combined process of limestone calcination and coke burning in a reactor with allowance for kinetics of physical and chemical transformations.…
The current project was undertaken to develop a three-dimensional model incorporating all the physical aspects of coke calcination. The model is described in the following section. As a first test, it was used for the simulation of the thermal performance of a pilot kiln for which experimental data are available.
Rotary kilns have been used successfully for many years to produce calcined coke for the aluminium industry and they offer a high level of automation, performance and flexibility. Shaft calciners make a high bulk density, coarse particle size product and several papers have been published recently highlighting these benefits.
To control the calcination level of calcined petroleum coke (CPC) during production, real density (RD) and crystallite size (LC) are key measures for coke calciners [1]. For rotary kiln calcined coke, calcination levels typically range from an RD of 2.04 to 2.07 g/cm3and LC of 24 to 29 Å.
Evaluation and analysis of exergoeconomic performance for the calcination process of green petroleum coke in vertical shaft kiln
Rotary kilns are used in several industrial applications comprising lime and cement firing [2], petroleum coke calcination [3], and aluminum oxide calcination [4,5].
For more reliable control of calcination, the num-ber of adjustable parameters is reduced to a minimum. The kiln load and the number of drum revolutions tend to be kept constant and not used as control parameters. Variations in loading exert a harmful effect on both the quality of the calcined coke and the durability of the lining.
Rotary kilns are used in several industrial applications comprising lime and cement firing [2], petroleum coke calcination [3], and aluminum oxide calcination [4,5].
HYSYS) to simulate the petroleum coke calcination based on industrial data, and found the relationship between the real density of CPC and the calcination temperature.
In the cement manufacturing process, the rotary kiln is used for the calcination of limestone (calcium carbonate) to produce lime (calcium oxide), a process known as calcination. This reaction, crucial in cement production, occurs at high temperatures approximately 900°C to 1000°C: The produced lime then reacts with silica, …
AGICO provides some tips about how to control kiln temperatures. The measures mostly are about change kiln's fuel, feed volume and rotation speed.
In alignment with the subject, design of experiment (DOE) has been conducted to study newly introduced calcined petroleum coke performance/behavior within Ma'aden Aluminum (MA) green anode plant. green petroleum coke (GPC) batch selected under this study was calcined through a vertical shaft kiln technology against regular coke used at Ma ...
Abstract. A mathematical model of the steady-state process of limestone burning in a kiln is proposed in the one-dimensional approximation. The model is developed on the basis of the laws of ...
A study on coke dust generation in a rotary calcination kiln. One of the steps in the production of carbon electrodes is the green coke calcination. This allows the removal of moisture and volatile matter, and also the restructuring of the coke. Coke dust is a byproduct of this process and has an important impact on the process.
A three-dimensional steady-state mathematical model of a rotary calcining kiln for the petroleum coke is presented. The model takes into account all the physical phenomena of interest, from gas flow, heat transfer, volatile matter and coke dust evolution and combustion, to the granular bed motion and the thermal effects of the refractories.
The aim of this work was to establish a mathematical model for the analysis of calcining process of petroleum coke in a 24-pot calciner via computational fluid dynamics (CFD) numerical simulation ...
coke from green coke in a tubular rotary kiln. A high quality calcinated coke is obviously necessary both for metallurgy and chemical industry, hence its properties should meet the corresponding ...
The structural and the operational parameters of the kiln are presented in Tables 1 and 2, respectively. The composition of the green petroleum coke is shown in Table 3. ...
The key operation parameters in rotary kiln are optimized using improved case-based reasoning (CBR). The case searching and matching adopted the weighted k-nearest neighbor (KNN) approach. An ...
The aim of this work was to establish a mathematical model for the analysis of calcining process of petroleum coke in a 24-pot calciner via computational fluid dynamics (CFD) numerical simulation method. The model can be divided into two main parts (1) heterogeneous reacting flow of petroleum coke calcination in the pot was simulated …
Green petroleum coke is calcined in a rotary kiln under protective atmosphere at temperatures around 1100°C. The process is similar to the calcination of the torrefied carbohydrate, but yields ...
After removing the moisture by the drying kiln, dried green petroleum coke is then undergone the calcination process in the rotary kiln. Afterwards, it is then cooled to a temperature below 80 o C ...
Rotary kilns are large rotating cylinders used for processes like drying, calcination, and sintering of materials continuously using hot gases generated inside or outside the kiln. Dajia designs kilns for applications such as cement production, pet coke calcination, and sponge iron manufacturing.
A 2D axisymmetric computational fluid dynamics (CFD) model, coupled to a 1D bed model, has been developed to capture the key processes that occur within rotary lime kilns. The model simulates the calcination reaction using a shrinking core model, and predicts the start of calcination and the degree of calcination at the end of the kiln. The …
The design concept and calcining process of rotary hearth calciners have been described previously. 16 The coke moves slowly from the outside perimeter of the rotary hearth kiln guided by rabbles …
Petroleum coke is usually calcined in rotary kiln. It is a very prevalent problem of unstable production conditions and low recovery rates in coke calcination process. The temperature field in calcining zone is a crucial factor that affects the output and quality of calcined petroleum coke (CPC). Based on the analysis of the major factors affecting the …
The catalyst calcination process relies on an indirect-fired rotary kiln to allow for processing in an inert atmosphere, and for precise control over temperature zones, with retention time and temperature profile being …
A three-dimensional steady-state model to predict the flow and heat transfer in a rotary lime kiln is presented. All important phenomena are considered for the pre-heat and calcination zones including turbulent gas flow, buoyancy, all modes of heat transfer, evolution and combustion of species and granular bed motion with calcination reaction.
