Abstract The challenging problem of improving the control of a rotary coke calcining kiln is discussed. An overview of works on simulating such kilns is presented, a mathematical model of the technological process for use in a control system is proposed, and approaches to developing a control system in the SimInTech environment are …
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The typical calcining plant consists of one or more rotary kilns, a rotary cooler, settling chamber and stack. Typically, petroleum coke is fed into the backend of the rotary kiln. Rotary kilns are lined with refractory monolithics or brick. As the coke travels down the rotary kiln, it passes through numerous sections, some containing ...
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July 23, 2019. Retort calciner and rotary kiln are the two main types for petroleum coke calcination. Rotary kiln is widely used in Europe and the United States, while retort calciner is used earlier and more in China. There are great differences between the two in calcination process principle, yield, capacity, calcination quality, floor area ...
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There are two main types of petroleum coke: green coke and calcined coke. 1. Green Coke. Green coke is the raw material used to produce calcined coke. It is the solid carbon byproduct of the oil refining process. Green coke has a high moisture and volatile matter content. 2. Calcined Coke. Calcined coke is the product from the …
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a wide range of green coke feeds including needle, shot, fluid or tar pitch cokes. The rotary kiln is also able to optimize the coke calcining operating parameters, such as time, temperature gradient and heat up rate - all of which can greatly impact product quality.
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Coke Calcining Plants. Coke-calcining plants receive green petroleum coke from oil refineries. The green coke is blended and fed into rotary kilns operating up to 2800°F under a reducing condition. The material exits the rotary kiln as calcined coke with a correct crystalline structure and electrical conductivity properties.
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The challenge is to reach a high calcining temperature with a low heating rate without unduly lengthening the kiln. 90 REDUCTION AND CASTING OF ALUMINUM Green coke feed Zone 1 Green under-calcined coke Calcined coke to cooler Fig. 3. Schematic presentation of coke calcining kiln fitted with shell mounted fan. Fuel-less operation.
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The thermal diffusivity of petroleum coke decreased during the calcining process. With increasing temperature, coefficient of heat conductivity and specific volume heat of the petroleum coke increased with a decreasing variation rate. ... M.A. Diez, G. de la Puente, et al., "Thermal behaviour and reactivity of green petroleum cokes used as ...
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It is found that the rate-based simulation can be implemented as a useful tool to predict the operating conditions needed to control the content of undesirable impurities in the calcined petroleum coke, namely, sulfur, volatile matter and moisture contents. This paper presents the simulation of the green petroleum coke calcining processes using the simulation …
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2. Green coke feeding system There are many more calcination units and feeding entrances for the new generation shaft calciners. An automatic green coke distribution …
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There are more than 20 petroleum coke calcining systems operating safely in China, 6 of which are EPC projects, and most of them are tank calcining furnace processes. He has more than 20 years of experience in the design, process, equipment manufacturing, installation and commissioning, operation training, and after-sales service of petroleum ...
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Definitions. Green coke is dried, preheated and fed to a choking zone of a vertical kiln for calcining in suspension with countercurrent flow of ascending flue gas; then further calcined in a free fall zone of the kiln by contact with ascending combustion gas. Coke is retained in a radiant-heat-soaking zone before removal for cooling. Fines are recovered …
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potential for toxicity for calcined coke. Calcinations of coke are usually d one in a rotary kiln at about. 1300°C to 1500°C. During the process the coke is further. decomposed, increasing in ...
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The calcining process is composed of the petroleum coke charger (black), fluidized bed calciner with electrodes and nitrogen supply (red), and gas cleaning system (yellow-gold). The waste heat utilization system (or advanced CHP) is composed of the combustor/boiler (purple), coke cooler (blue), and generator (blue-violet).
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Typical needle coke specifications Item Green coke Calcined coke Volatile Matter Volatile Matter Bulk Density Bulk Density Real Density Real Density Reference no. description …
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of kinetics-based simulation described in this study may be used to predict coke calcining kilns performance regardless of the green coke composition. Keywords: Rotary Kiln, Calcining Processes, Kinetics, Simulation. 1 Introduction Calcined petroleum coke (CPC) suitable for aluminum industry anodes calls for a high quality standard.
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A method of calcining green petroleum coke which includes separating the green coke having a particle size of between 0.1 mm and 50 mm into undersized and oversized fractions, pelletizing the undersized fraction with a binder to form pelletized coke, combining the oversized fraction and the pelletized coke to form a feed mixture, and calcining ...
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WebCoke-calcining plants receive green petroleum coke from oil refineries. The green coke is blended and fed into rotary kilns operating up to 2800 F under a reducing condition. The material exits the rotary kiln as calcined coke with a correct crystalline structure and electrical conductivity properties. These coke properties allow this ...
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Apparatus for calcining green coke Free Patents Online. Jun 19, 1979· In an apparatus for calcining green coke to produce calcined coke, ... the details of the inductive feeding system including feed pipe 18 will be described.
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A hollow, high-temperature alloy pipe with motive means to move air there through is employed as a support structure for supporting the feed pipe in a conventional coke-calcining apparatus. The support pipe is horseshoe shaped, and the feed pipe is received in the seat of the horseshoe.
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Abstract. Kinetic analysis of the green petroleum coke calcining processes using the simulation program HYSYS and actual industrial data is presented. The rates of physical and chemical phenomena of interest, such as the rate of moisture removal, rates of volatile matter release and combustion, rates of coke dust and sulphur combustion were all ...
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This process is carried out in a calcining rotary kiln. A typical kiln for petroleum coke is about 60 m long with a diameter of 2.5 m. The kiln is tilted by an angle of about 2–5° and rotates at speeds of 2–4 rpm. Air (primary and secondary) for combustion is injected through the burner at the solids discharge end of the kiln.
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Kinetic analysis of the green petroleum coke calcining processes using the simulation program HYSYS and actual industrial data is presented. ... the whole calcination system is determined as 0.507 ...
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coke delsulfurized and carbon oxidized at temperatures of 1250 to 1400 °C. All these zones were simulated as continuous stirred tank reactors Fig. 1. Calcining Processes Zones 2.1 Moisture Release Rate The water in the pores of the coke is heated by the counter flow of the flue gases in the kiln and is driven off the coke.
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a wide range of green coke feeds including needle, shot, fluid or tar pitch cokes. The rotary kiln is also able to ... Coke calcining systems Table 2. Typical needle coke specification Item Green coke Calcined coke Moisture 6% - 14% 0.1% ... 101 Kiln feed bin 102 Weigh feeder 103 Feed hood 104 Rotary kiln 105* Tertiary air system
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Due to the capacity, it uses several sources of green coke resulting in cokes with different properties. The range includes all types of coke of different sulfur content: low-sulfur—up to 1.5% of sulfur, medium-sulfur—up to 3.0% and higher-sulfur more than 3.0%. All the cokes come from the C.I.S counties (Table 1).
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Coke calcination is a process that involves the heating of green petroleum coke in order to remove volatile material and purify the coke for further processing. Calcined coke is vital …
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Rate-based Simulation of Coke Calcination in Rotary Kilns. It is found that the rate-based simulation can be implemented as a useful tool to predict the operating conditions needed to control the content of undesirable impurities in the calcined petroleum coke, namely, sulfur, volatile matter and moisture contents.
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First is the drying zone where the moisture is removed from the coke. Further down the kiln the coke reaches the devolatilization and calcination zone. In this part of the kiln the temperature increases up to 1250° C where the combustion takes place. Also the third air is blown into the kiln in this section.
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Abstract. A method of calcining green petroleum coke which includes separating the green cokehaving a particle size of between 0.1 mm and 50 mm into undersized and oversized fractions,pelletizing the undersized fraction with a binder to form pelletized coke, combining theoversized fraction and the pelletized coke to form a feed …
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Apparatus for calcining green coke . United States Patent 4158541 . Abstract: A hollow, high-temperature alloy pipe with motive means to move air there through is employed as a support structure for supporting the feed pipe in a conventional coke-calcining apparatus. ... The support pipe is horseshoe shaped, and the feed pipe is received in the ...
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