rotary kiln technical

technical innovation in energy-saving rotary kiln - luckysummer123

It is understood that the rotary kiln drying technology is involved in chemical, petrochemical, pharmaceutical, building materials, light industry, feed, food, paper, wood, food and other industries. The drying process is the high energy-consuming processes, its energy consumption accounts for about 12 percent of total domestic energy consumption, while the average energy efficiency of the drying process is only 40% to 50%. Foreign advanced level is generally reached more than 70%. However, to the situation of foreign monopoly rotary kiln and other large energy-saving drying equipment manufacturing has always existed, I recently increased the dryer market, technical R & D investment, many high-tech scientific research with the research results of the independent intellectual property rights, will A major innovation of the standard dryer market in China Zhengzhou Red Star equipment, corresponding to the national call, the industry needs all kinds of major energy-saving drying equipment and the industry faces significant drying of common technology, the application of basic theoretical and applied research; in accordance with the conversion generation, the generation of pre-research generation of ideas, according to the different types of drying techniques for original innovation, integrated innovation and the introduction of absorption and innovation; different disciplines of the integration of thermodynamics, heat transfer, fluid mechanics theory, explore the drying process, heat and mass transfer law, the establishment of key industries large-scale drying equipment and drying process engineering model; to develop international standard software proved the law of the drying process, and then by small scale pilot to develop large-scale drying equipment and advanced drying technology. Completely out of the passive situation of the domestic large-scale drying equipment made to go the simple imitation of path. Devote themselves to the study of the technical department, Red Star energy-saving rotary kiln was a major technological breakthrough. Red Star energy-saving rotary kiln wireless temperature measurement equipment, using the latest wireless communication technology, kiln thermocouple measured temperature data to the operating room display. The kiln temperature transmitter, battery-powered, can simultaneously acquire multiple thermocouple signal. Install it in a kiln, a rotation with the cylinder, take insulation measures, able to tolerate the tube radiation high temperature above 300 , anti-rain, sunscreen, anti-vibration. Red Star under the guidance of the R & D staff, production of energy-saving rotary kiln has been received in the market. Red Star company has a strong service team. "Careful, meticulous, harmony, from pre-sales advice, enthusiastic service to promote products in the sale, they are required to carefully treat every customer, meticulous work, and customer relationships to be harmonious.

Strong design research, manufacturing, installation and commissioning, technical maintenance, non-scheduled return visit, strict quality assurance and quick after-sales services, we have made careful arrangements in every aspect to solve the customer a series of worries.

We provide Professional technology, excellent product quality and intimate after-sales service when you purchase Vibrating grizzly feeder, Vibrating screen, from our company.As a professional mining machinery exporter, we will win your trust with our delivery speed, Enterprises Credit and product quality.

rotary kiln|circumgyrate kiln|limestone rotary kiln|rrevolving kiln

Rotary kiln refers to rotary calcining kiln which belongs to building material equipment. According to the material types to be processed, rotary kiln can be divided into cement kiln, metallurgical chemistry kiln and limestone kiln.

Cement kiln is mainly used for calcining the cement clinker and it can be divided into dry-producing cement kiln and wet-producing cement kiln. Metallurgical chemistry kiln is mainly used for the magnetizing roasting of the lean iron ore and the oxidizing roasting of the chromium and josephinite in the steel works in the metallurgical industry, for the roasting of high alumina bauxite ore in the refractory plant, for the roasting of clinker and aluminium hydroxide in the aluminium manufacturing plant and for the roasting of chrome ore in the chemical plant. Limestone kiln is mainly used for roasting active lime and lightly calcined dolomite used in the steel works and ferroalloy works.

Product Specification m Kilndimensions Motor power kw Total weight t note Diameter m Length m Obliquity % Capacity t/d Rotation speed r/min 2.540 2.5 40 3.5 180 0.44-2.44 55 149.61 ----- 2.550 2.5 50 3 200 0.62-1.86 55 187.37 ----- 2.554 2.5 54 3.5 280 0.48-1.45 55 196.29 outside disassemble kiln 2.742 2.7 42 3.5 320 0.10-1.52 55 198.5 ------ 2.844 2.8 44 3.5 450 0.437-2.18 55 201.58 outside disassemble kiln 3.045 3 45 3.5 500 0.5-2.47 75 210.94 ------ 3.048 3 48 3.5 700 0.6-3.48 100 237 outside disassemble klin 3.060 3 60 3 800 0.3-2 100 310 ------ 3.250 3.5 50 4 1000 0.6-3 125 278 disassemble klin 3.352 3.3 52 3.5 1300 0.266-2.66 125 283 kiln with preheater precalcine 3.554 3.5 54 3.5 1500 0.55-3.4 220 363 kiln with prehrater precalcine 3.670 3.6 70 3.5 1800 0.25-1.25 125 419 Generating klin for usimg ofterheat 4.056 4 56 4 2300 0.41-4.07 315 456 klin with prehrater precalcine 4.060 4 60 3.5 2500 0.396-3.96 315 510 klin with prehrater precalcine 4.260 4.2 60 4 2750 0.41-4.07 375 633 klin with prehrater precalcine 4.360 4.3 60 3.5 3200 0.396-3.96 375 583 klin with prehrater precalcine 4.566 4.5 66 3.5 4000 0.41-4.1 560 710.4 klin with prehrater precalcine 4.774 4.7 74 4 4500 0.35-4 630 849 klin with prehrater precalcine 4.874 4.8 74 4 5000 0.396-3.96 630 899 klin with prehrater precalcine 5.074 5 74 4 6000 0.35-4 710 944 klin with prehrater precalcine 5.687 5.6 87 4 8000 Max4.23 800 1265 klin with prehrater precalcine 6.095 6 95 4 10000 Max5 9502 1659 klin with prehrater precalcine

rotary kiln incinerator - design and manufacture

The rotary kiln incinerator is manufactured with a rotating combustion chamber that keeps waste moving, thereby allowing it to vaporize for easier burning. Types of waste treated in a rotary kiln incinerator

The picture"photo 1"gives a schematic overvieuw of the systemmanufactured totreat the waste in a rotating drum, we use a counter current rotary kiln. There are 2 different types of rotary kiln, co-current rotary kilns and counter current rotary kilns. Read here more about the different types of rotary kiln.

Energy recovery is always an individual design, and very attractive is electricity. But electricity is also the most complicated and less economical profitable for small installations ( the min. capacity is 3 ton/h of waste). If heat can be used in another process on site, for example in a dryer. It has to be taken into consideration that a connection between incinerator and the production process (dryer) can be the most efficient solution. The disadvantage can be if there is a production stop of the incinerator, the process (dryer) can not always stop at the same time.

For example : We produce steam as energy recovery, also for electricity production. The post combustion is strictly vertical and the boiler also has a vertical design for evacuation of dust. Our design is made for continuous operation of a steam boiler. The next drawing gives a possible set up of the installation. This is our set-up, created by people with operation experience with incinerators, and it results in this lay-out.

Depending on the amount of Chlorine, S, N or other chemicals in the waste stream there is a wet or/and dry scrubbing system available for the flue gas treatment. Flue gas treatment systems are standard systems, and normal chemical reaction. So, for correct flue gas treatment we need to take care for:

mechanical maintenance of rotary kilns and dryers

Join project engineers, maintenance supervisors, repairmen and plant managers when FLSmidth hosts a 3-1/2 day seminar inSioux City, Iowaon mechanical maintenance of rotary kilns and dryers. The seminar comprises 3 days of presentations and a 1/2-day of hands-on training, including roller adjustments, ovality measurements and documented inspection on our full-scale 3-pier training kiln. Most aspects of kiln and dryer mechanical maintenance are taught by our engineers with 30+ years of experience in the rotary equipment industry. Beyond what you will learn about your rotary kiln and dryer maintenance, this seminar provides excellent networking opportunities with our specialists as well as your industry counterparts.

The seminar comprises 3 days of presentations and a 1/2-day of hands-on training, including roller adjustments, ovality measurements and documented inspection on our full-scale 3-pier training kiln. Most aspects of kiln and dryer mechanical maintenance are taught by our engineers with 30+ years of experience in the rotary equipment industry. Beyond what you will learn about your rotary kiln and dryer maintenance, this seminar provides excellent networking opportunities with our specialists as well as your industry counterparts.

FLSmidth reserves the right to cancel seminars and training courses if there are not enough applicants to meet the objectives of a given seminar or training course. In case of cancellation, notification will be sent direct to all applicants.

FLSmidth provides sustainable productivity to the global mining and cement industries. We deliver market-leading engineering, equipment and service solutions that enable our customers to improve performance, drive down costs and reduce environmental impact. Our operations span the globe and we are close to 10,200 employees, present in more than 60 countries. In 2020, FLSmidth generated revenue of DKK 16.4 billion. MissionZero is our sustainability ambition towards zero emissions in mining and cement by 2030.

rotary kiln

Rotary kilns are similar to cement kilns, but the main difference is the reverse flow of gypsum. Gypsum plaster is exposed at 600-650C temperature during feeding in the kiln, at the end of the kiln it occurs around 150-160C.

Calcination; after crushing process gypsum size is reduced to 0-8 mm. Sized gypsum feeds the kiln regularly by weighing belt. Gypsum moves through to the kiln depending on inclination and rotation of the kiln then calcined products come out. To reduce size of the calcined grains is transferred to grinding and classification steps.

rotary kiln - an overview | sciencedirect topics

Rotary kilns are synonymous with cement making, being the workhorses of this industry. There are many types of rotary kiln arrangements for producing cement clinker with each incremental design goal aimed at improving energy efficiency, ease of operation, and product quality and minimizing environmental pollutants. Rotary cement kilns can be classified into wet-process kilns, semidry kilns, dry kilns, preheater kilns, and precalciner kilns. All of these are described in the book by Peray (1986) and many others, hence we will not dwell upon them here. Rather, we will briefly show the pertinent process chemistry and the heat requirements that drive them, so as to be consistent with the transport phenomena theme.

Rotary kilns have been used in various industrial applications (e.g., oil shale retorting, tar sands coking, incineration, cement production, etc.). The rotation of a cylinder-shaped vessel positioned longitudinally approximately 30 of the horizontal position ensures a continuous motion of catalyst between the entrance and exit of the kiln. With regard to the spent catalyst regeneration, the description of rotary kilns was given by Ellingham and Garrett [451]. There are two types of rotary kilns, i.e., direct fire and indirect fire.

The direct fire is a single shell vessel with rings added inside to slow the catalyst as it tumbles from the inlet (elevated part) towards outlet (lower part). The oxidation medium flows countercurrent to catalyst movement. The O2 concentration in the medium will decrease in the same direction because of its consumption. Therefore, the zone in the vessel located near the inlet may function as a stripper of volatile components of coke. The kiln is fired by gas burners directly against the outer shell of the vessel. The temperature inside the kiln is controlled by adjusting the burner heat, varying concentration of O2 in the oxidizing medium and its flow. The indirect fire kiln comprises a double-shell cylinder vessel. The inner shell is similar as that of the direct fire kiln. The space between the shells is heated either by combustion gas or steam. In some cases, the inner cylinder shell is ebullated allowing hot gases or steam to enter and contact the tumbled catalyst. The catalyst temperatures are controlled by monitoring the temperatures of the inlet and outlet gases. It is believed that Eurocat process evolved from a rotary kiln process by be improving the control of operating parameters such as temperature, gas flow, speed of rotation, etc.

The rotary kiln is used to process the lead-containing components resulting from the breaking and separation of waste batteries. The main components of a rotary kiln are an inclined cylindrical, refractory-lined reaction shaft equipped to rotate over rollers and a burner. Process heat is generated by burning fine coke or coal contained in the charge and by the exothermic heat of the PbO reduction by CO. This process produces molten lead and a slag with 35% Pb. A drawback of this technology is the short life of refractory liners.

The rotary kiln is a long tube that is positioned at an angle near horizontal and is rotated. The angle and the rotation allow solid reactants to work their way down the tube. Speed and angle dictate the retention time in the kiln. Gas is passed through the tube countercurrent to the solid reactant. The kiln is operated at high temperatures with three or four heating zones depending on whether a wet or dry feed is used. These zones are drying, heating, reaction, and soaking. Bed depth is controlled at any location in the tube with the use of a ring dam.

The most common reactor of this type is the lime kiln. This is a noncatalytic reaction where gas reacts with calcium carbonate moving down the kiln. Other reactions performed in the rotary kiln include calcination, oxidation, and chloridization.

Use of rotary kilns for hazardous waste incineration is becoming more common for disposal of chlorinated hydrocarbons such as polychlorinated biphenyls (PCBs). Flow in these kilns is cocurrent. Major advantages include high temperature, long residence time, and flexibility to process gas, liquid, solid, or drummed wastes.

The rotary kilns used in the first half of the twentieth century were wet process kilns which were fed with raw mix in the form of a slurry. Moisture contents were typically 40% by mass and although the wet process enabled the raw mix to be homogenized easily, it carried a very heavy fuel penalty as the water present had to be driven off in the kiln.

In the second half of the twentieth century significant advances were made which have culminated in the development of the precalciner dry process kiln. In this type of kiln, the energy-consuming stage of decarbonating the limestone present in the raw mix is completed before the feed enters the rotary kiln. The precalcination of the feed brings many advantages, the most important of which is high kiln output from a relatively short and small-diameter rotary kiln. Almost all new kilns installed since 1980 have been of this type. Figure1.4 illustrates the main features of a precalciner kiln.

The raw materials are ground to a fineness, which will enable satisfactory combination to be achieved under normal operating conditions. The required fineness depends on the nature of the raw materials but is typically in the range 1030% retained on a 90 micron sieve. The homogenized raw meal is introduced into the top of the preheater tower and passes downwards through a series of cyclones to the precalciner vessel. The raw meal is suspended in the gas stream and heat exchange is rapid. In the precalciner vessel the meal is flash heated to ~900C and although the material residence time in the vessel is only a few seconds, approximately 90% of the limestone in the meal is decarbonated before entering the rotary kiln. In the rotary kiln the feed is heated to ~ 1500C and as a result of the tumbling action and the partial melting it is converted into the granular material known as clinker. Material residence time in the rotary kiln of a precalciner process is typically 30 minutes. The clinker exits the rotary kiln at ~ 1200C and is cooled to ~60C in the cooler before going to storage and then being ground with gypsum (calcium sulfate) to produce cement. The air which cools the clinker is used as preheated combustion air thus improving the thermal efficiency of the process. As will be discussed in section1.5, the calcium sulfate is added to control the initial hydration reactions of the cement and prevent rapid, or flash, setting.

If coal is the sole fuel in use then a modem kiln will consume approximately 12 tonnes of coal for every 100 tonnes of clinker produced. Approximately 60% of the fuel input will be burned in the precalciner vessel. The high fuel loading in the static precalciner vessel reduces the size of rotary kiln required for a given output and also reduces the consumption of refractories. A wider range of fuel types (for example, tyre chips) can be burnt in the precalciner vessel than is possible in the rotary kiln.

Although kilns with daily clinker outputs of ~9000tonnes are in production in Asia most modem precalciner kilns in operation in Europe have a production capability of between 3000 and 5000 tonnes per day.

A rotary kiln is a physically large process unit used in cement production where limestone is decomposed into calcium oxide which forms the basis of cement clinker particles under high temperatures. The modelling of rotary kilns are well documented in literature. Mujumdar et al. 2007 developed an iteration based rotary kiln simulator (RoCKS), which integrates models for a pre-heater, calciner, kiln and clinker cooling that agreed well with observations in industry. The model takes complexities in reactions and heat transfers with different sections into account by coupling multiple models with common boundaries regarding heat and mass communications. Other work (Ngadi and Lahlaouti, 2017) neatly demonstrates an experimentally proven kiln model being applied for screening of combustion fuel used for kilns, and how it may impact the production. This contribution coupled modelling of reactions and heat transfer in the bed region and another model for combustion and heat transfer in the freeboard region.

While modelling of these processes with varying degree of complexity has been performed, proper uncertainty and sensitivity analysis of these models have not been given due importance/consideration. As the use of computer aided process engineering tools increases, the need for robust uncertainty and sensitivity analysis frameworks becomes more important. There are several frameworks of uncertainty and sensitivity analysis applied for different problems, from good modelling practice (Sin et al., 2009) to process design and product design (Frutiger et al. 2016). These frameworks typically include the following steps (0) problem statement, (i) identification of input sources of uncertainties, (ii) sampling (iii) Monte Carlo simulations and (vi) sensitivity analysis. The purpose of this work is to perform a systematic uncertainty and sensitivity analysis of rotary kiln process design in order to address the following: (1) Given a certain base case design, what is the impact of uncertainties in the model and measurements on the key process design metrics (minimum required reactor length and degree of conversion), and, (2) given a certain source of uncertainties, what is the robust design to ensure process performance with 95 % confidence.

The rotary kiln is often used in solid/liquid waste incineration because of its versatility in processing solid, liquid, and containerized wastes. The kiln is refractory lined. The shell is mounted at a 5 degree incline from the horizontal plane to facilitate mixing the waste materials. A conveyor system or a ram usually feeds solid wastes and drummed wastes. Liquid hazardous wastes are injected through a nozzle(s). Non-combustible metal and other residues are discharged as ash at the end of the kiln. Rotary kilns are also frequently used to burn hazardous wastes.

Rotary kiln incinerators are cylindrical, refractory-lined steel shells supported by two or more steel trundles that ride on rollers, allowing the kiln to rotate on its horizontal axis. The refractory lining is resistant to corrosion from the acid gases generated during the incineration process. Rotary kiln incinerators usually have a length-to-diameter (L/D) ratio between 2 and 8. Rotational speeds range between 0.5 and 2.5 cm/s, depending on the kiln periphery. High L/D ratios and slower rotational speeds are used for wastes requiring longer residence times. The kilns range from 2 to 5 meters in diameter and 8 to 40 meters in length. Rotation rate of the kiln and residence time for solids are inversely related; as the rotation rate increases, residence time for solids decreases. Residence time for the waste feeds varied from 30 to 80 minutes, and the kiln rotation rate ranges from 30 to 120 revolutions per hour. Another factor that has an effect on residence time is the orientation of the kiln. Kilns are oriented on a slight incline, a position referred to as the rake. The rake typically is inclined 5 from the horizontal.

Hazardous or non-hazardous wastes are fed directly into the rotary kiln, either continuously or semi-continuously through arm feeders, auger screw feeders, or belt feeders to feed solid wastes. Hazardous liquid wastes can also be injected by a waste lance or mixed with solid wastes. Rotary kiln systems typically include secondary combustion chambers of afterburners to ensure complete destruction of the hazardous waste. Operating kiln temperatures range from 800C to 1,300C in the secondary combustion chamber or afterburner depending on the type of wastes. Liquid wastes are often injected into the kiln combustion chamber.

The advantages of the rotary kiln include the ability to handle a variety of wastes, high operating temperature, and continuous mixing of incoming wastes. The disadvantages are high capital and operating costs and the need for trained personnel. Maintenance costs can also be high because of the abrasive characteristics of the waste and exposure of moving parts to high incineration temperatures.

A cement kiln incinerator is an option that can be used to incinerate most hazardous and non-hazardous wastes. The rotary kiln type is the typical furnace used in all cement factories. Rotary kilns used in the cement industry are much larger in diameter and longer in length than the previously discussed incinerator.

The manufacture of cement from limestone requires high kiln temperatures (1,400C) and long residence times, creating an excellent opportunity for hazardous waste destruction. Further, the lime can neutralize the hydrogen chloride generated from chlorinated wastes without adversely affecting the properties of the cement. Liquid hazardous wastes with high heat contents are an ideal supplemental fuel for cement kilns and promote the concept of recycling and recovery. As much as 40% of the fuel requirement of a well-operated cement kiln can be supplied by hazardous wastes such as solvents, paint thinners, and dry cleaning fluids. The selection of hazardous wastes to be used in cement kiln incinerators is very important not only to treat the hazardous wastes but also to reap some benefits as alternative fuel and alternative raw material without affecting both the product properties and gas emissions. However, if hazardous waste is burned in a cement kiln, attention has to be given to the compounds that may be released as air emissions because of the combustion of the hazardous waste. The savings in fuel cost due to use of hazardous waste as a fuel may offset the cost of additional air emission control systems in a cement kiln. Therefore with proper emission control systems, cement kilns may be an economical option for incineration of hazardous waste.

The rotary kiln gasifier is used in several applications, varying from industrial waste to cement production and the reactor accomplishes two objectives simultaneously: (1) moving solids into and out of a high temperature reaction zone and (2) assuring thorough mixing of the solids during reaction. The kiln is typically comprised of a steel cylindrical shell lined with abrasion-resistant refractory to prevent overheating of the metal and is usually inclined slightly toward the discharge port. The movement of the solids being processed is controlled by the speed of rotation of the kiln.

The moving grate gasifier is based on the system used for waste combustion in a waste-to-energy process. The constant-flow grate feeds the waste feedstock continuously to the incinerator furnace and provides movement of the waste bed and ash residue toward the discharge end of the grate. During the operation stoking and mixing of the burning material enhances distribution of the feedstocks and, hence, equalization of the feedstock composition in the gasifier. The thermal conversion takes place in two stages: (1) the primary chamber for gasification of the waste (typically at an equivalence ratio of 0.5) and (2) the secondary chamber for high temperature oxidation of the synthesis gas produced in the primary chamber (Grimshaw and Lago, 2010; Hankalin et al., 2011).

The rotary kiln ICM/Phoenix Bioenergy demonstration gasifier was operated at a transfer station in Newton, Kansas from 2009 to 2012 for more than 3200h, testing various types of biomass, RDF, tire-derived fuel or automobile shredded residue mixed with RDF. The 150-t-per-day facility reported to have tested more than 16 types of feedstock listed in Table 3.2 [13].

The gasification process consists of a horizontal cylinder with an internal auger which slowly rotates [15] allowing feedstock to move through the reactor, whereas air is injected at multiple points. Only small portion of the syngas was used to produce steam, whereas the rest was flared (Fig. 3.2).

Unfortunately, ICM had to take down the demonstration gasifier at the transfer station, upon completion of the project and financing grant, declaring that the facility did not prove to be a viable solution for the county. Some of the problems that ICM mention [16] were related to the availability of feedstock of only 90t per day, whereas the prototype was designed for 150t per day, but also insufficient investment from financial partners due to the lower projected returns. ICM announced that through a contract with the City of San Jose, CA they will have the ICM demonstration gasifier at the San Jos-Santa Clara Regional Wastewater Facility [17]. The facility will process 10 short tons per day of woody biomass, yard waste or construction and demolition materials mixed with biosolids from the WWT.

rotary kiln-fote machinery

Rotary kiln refers to rotary calcination kiln, belonging to cement building materials equipment. It is widely used in ore beneficiation, metallurgy, building materials, chemicals, electricity, petroleum, coal, transportation, fertilizer, gas and other industries. Rotary kiln is mainly used for calcination of cement clinker, including dry and wet production cement kilns. Metallurgical chemical kiln is mainly used for the magnetization and calcination of lean iron ore in metallurgical industry, the oxidation and calcination of chromite and josephinite, etc.

1. Easy maintenance and installation: Larger rotary kiln is equipped with auxiliary transmission drive for the cylinder to rotate at very low speed, which can meet the needs of installation and maintenance.

2. Good sealing performance: In order to prevent cold air from entering and smoke dust overflowing cylinder, there is reliable sealing devices on the feed end (tail) and discharge end (head) of the cylinder.

According to different processing materials, rotary kiln can be divided into cement kiln, metallurgical chemical kiln and lime kiln. According to their production purposes, the rotary kiln produced by our company can be divided into: ceramsite rotary kiln, metallurgical rotary kiln, chemical rotary kiln, white ash rotary kiln and active lime rotary kiln, etc. Of all, cement

rotary kilns | sciencedirect

Rotary Kilnsrotating industrial drying ovensare used for a wide variety of applications including processing raw minerals and feedstocks as well as heat-treating hazardous wastes. They are particularly critical in the manufacture of Portland cement. Their design and operation is critical to their efficient usage, which if done incorrectly can result in improperly treated materials and excessive, high fuel costs. This professional reference book will be the first comprehensive book in many years that treats all engineering aspects of rotary kilns, including a thorough grounding in the thermal and fluid principles involved in their operation, as well as how to properly design an engineering process that uses rotary kilns. Chapter 1: The Rotary Kiln Evolution & Phenomenon Chapter 2: Basic Description of Rotary Kiln Operation Chapter 3: Freeboard Aerodynamic Phenomena Chapter 4: Granular Flows in Rotary Kilns Chapter 5: Mixing & Segregation Chapter 6: Combustion and Flame Chapter 7: Freeboard Heat Transfer Chapter 8: Heat Transfer Processes in the Rotary Kiln Bed Chapter 9: Mass & Energy Balance Chapter 10: Rotary Kiln Minerals Process Applications

Rotary Kilnsrotating industrial drying ovensare used for a wide variety of applications including processing raw minerals and feedstocks as well as heat-treating hazardous wastes. They are particularly critical in the manufacture of Portland cement. Their design and operation is critical to their efficient usage, which if done incorrectly can result in improperly treated materials and excessive, high fuel costs. This professional reference book will be the first comprehensive book in many years that treats all engineering aspects of rotary kilns, including a thorough grounding in the thermal and fluid principles involved in their operation, as well as how to properly design an engineering process that uses rotary kilns. Chapter 1: The Rotary Kiln Evolution & Phenomenon Chapter 2: Basic Description of Rotary Kiln Operation Chapter 3: Freeboard Aerodynamic Phenomena Chapter 4: Granular Flows in Rotary Kilns Chapter 5: Mixing & Segregation Chapter 6: Combustion and Flame Chapter 7: Freeboard Heat Transfer Chapter 8: Heat Transfer Processes in the Rotary Kiln Bed Chapter 9: Mass & Energy Balance Chapter 10: Rotary Kiln Minerals Process Applications

Covers fluid flow, granular flow, mixing and segregation, and aerodynamics during turbulent mixing and recirculation Offers hard-to-find guidance on fuels used for rotary kilns, including fuel options such as natural gas versus coal-fired rotary kilns Explains principles of combustion and flame control, heat transfer and heating and material balances

Covers fluid flow, granular flow, mixing and segregation, and aerodynamics during turbulent mixing and recirculation Offers hard-to-find guidance on fuels used for rotary kilns, including fuel options such as natural gas versus coal-fired rotary kilns Explains principles of combustion and flame control, heat transfer and heating and material balances

rotary calciner services & toll processing | rotary kiln services | elan

Rotary calciners (sometimes referred to as rotary kilns) are used for a variety of material processing applications. These high temperature machines process materials into a desired form by changing the state or composition of a material, or removing moisture. Unlike directly fired calciners, indirect rotary calciners are heated from the outside of an enclosed chamber. This gives them the ability to process materials that are fine or dusty, susceptible to contamination or combustion, sensitive to oxidation, or thermally sensitive. With this advantage, indirect rotary calciners have the ability to process a wide variety of materials.

The rotary calcination process begins with raw materials that are fed into one end of the calciner. These materials are gradually heated along the chamber body of the calciner, often in various temperature zones. As the material is fed into the calciner, a rotating cylinder gently pushes the material along the chamber. This rotation promotes even material distribution and processing. Rotation speed and temperature are tightly controlled according to the desired process or material application. During this process, chemical reactions may take place, the state of the material may change, or moisture may be removed, depending on the specific application thats required. Because heat is applied from outside the chamber, material integrity is preserved throughout the process. After completing the heating process, the material often goes through a cooling phase within the chamber, and is then deposited at the opposite end of the calciner in its finished form.

Rotary calciners are occasionally used in conjunction with a spray dryer to process materials that have already been spray dried into to powders. This additional processing can accomplish desired material changes for advanced manufacturing applications.

Calcination, often referred to as thermal processing, involves heating a specified material to a specific temperature in order to cause thermal decomposition. For example, in the case of limestone, calcination is used to drive off carbon dioxide.

Thermal desorption refers to the process of utilizing heat to remove or vaporize a specific component from a material. Indirect rotary calciners are especially useful for this application, because the flame does not come into direct contact with the material.

Rotary calciners can also be used to dry bulk materials, because of their ability to tightly control air temperature and material integrity. In these applications, the machines are sometimes referred to as rotary kiln dryers.

Elan Technology offers toll processing services for a variety of raw materials and desired applications. Our indirect rotary calciner allows for precise material processing, with exact temperature and speed controls. We have the ability to process powders or pellets, and have implemented a system for automated unloading and loading of bulk bags or drums. These benefits offer clear advantages for your material processing needs.

Our contract rotary calciner services offer a cost-efficient option for your material processing requirements. In addition, we also offer toll spray drying services for our customers, offering further cost savings and precision material handling. Contact us today to learn more about the services we offer.