Kiln tail is made of length 1m 1Cr18Ni9Ti steel plate. PreviousSafety Operation Rules for Multifunctional Soil Remediation Rotary Kiln, NextThe Significance of Current Control of Rotary Kiln. Such a flame is projected from a burner-pipe (or "firing pipe") which acts like a large bunsen burner. The combustion process of the material is carried out slowly. The raw meal preheating and carbonate decomposition process of the suspension preheater kiln, especially the precalciner kiln, are basically moved to the precalciner system, which makes the movement speed of the materials in the kiln tend to be consistent, and creates conditions for improving the kiln speed, which is also the reason why the speed of the modern precalciner kiln has been greatly increased. Relying upon friction, cutting of rollers necessarily increased the rate of wear, and after being standard practice for many years, it was abandoned from the 1950s onward in favour of the use of mechanical thrusters to float the kiln. The rotation of the kiln can promote the mixing of materials in the rotary kiln (rotary kiln), so that the materials can mix and contact each other for reaction. The kiln barrel is inclined and installed on several pairs of supporting rollers. In order to understand a product, we must start from the inside to really facilitate the work in the future. The rotary dryer's drum is a slightly angled and rotatable cylinder with wet material entering from one end up and dry material collecting from the other end down. Equipment is installed to scrub these from the gas stream before passing to the atmosphere. Hot gases pass along the kiln, sometimes in the same direction as the process material (co-current), but usually in the opposite direction (counter-current). As the kiln rotates, material gradually moves down toward the lower end, and may undergo a certain amount of stirring and mixing. The process feedstock is fed into the upper end of the cylinder. Driven by adjustable frequency motor, hard tooth surface and three-level cylinder gear speed reducer drives open gear. A rotary kiln is a pyroprocessing device used to cause a chemical reaction or physical change in a solid material through the application of high temperature.Materials produce using rotary kiln include: CementsRefractoriesMetalworkingTitanium oxideAluminaVermiculiteIron ore pellets etc.The basic Components of a rotary kiln include:The shell,Refractory liningSupport tyres and rollersDrive gearsHeat exchangers.Four stages in the manufacture of Portland cement:Crushing and grinding the raw materialsBlending the raw materials in the correct proportionsBurning/calcining the mixture in a kilnGrinding the clinker together with some gypsum.All these are discussed in the video, do well to watch till the end and also subscribe to the channel. Safety Operation Rules for Multifunctional Soil Remediation Rotary Kiln, The Significance of Current Control of Rotary Kiln, 30 Years of Experience in Rotary Kiln Production, Office Add: Gongye Road and Tonghang Er Road crossing, Shangjie District, zhengzhou, Henan Province, China. The combustion of the kiln head fuel produces a . This device is easy to installation and safe to use. The QD kiln tail sealing device adopts the cylinder pressing end face contact type, the entire sealing ring is uniformly stressed and can eliminate the adverse effects caused by the installation and the deflection of the kiln shell. The kiln connects with a material exit hood at the lower end and ducts for waste gases. Rotary kiln is mainly composed of kiln shell, transmission device, support device, blocking wheel device, kiln head sealing device, kiln tail sealing device, kiln head cover and so on. According to its force and action principle, the retaining wheel can be divided into two types: mechanical retaining wheel and hydraulic retaining wheel. Rotary kiln; A combined elastic coupling is used between the pinion device and the main reducer, which has good elasticity, can absorb part of the impact, and can compensate for large radial deviation and axial expansion. As the drier revolves the chains slap the flights preventing concentrate from building up on dryers walls. Cement mill is the core equipment for grinding material after clinker production. 1. The kiln barrel part. Good sealing performance. In order to ensure that the kiln can still be operated when the main power supply is interrupted, to prevent the bending and deformation of the kiln cylinder, and to facilitate the maintenance of the kiln, an auxiliary transmission device is provided. . Compact and lightweight. A sleeve space is formed, and a special fan is provided to cool the kiln mouth. 1.The working movement principle of materials in the rotary kiln: 2.The combustion principle of fuel in the rotary kiln: 3.The principle of air flow in the rotary kiln, 4. Rotary Kiln Working Principle Because the cylinder has a certain slope and rotates at a certain speed, the raw meal will move from the back end to the front end when it is fed into the rotary kiln. in the kiln, the combustion temperature and gas temperature will change accordingly. This is a very important function and the operator will have to be sure that it is open at all times. The space between tire and raiser block is determined by expansion number, during normal operation, tire can cover cylinder moderate to reduce the radial deformation of cylinder. News Date:2016-06-28 16:43:29. Rotary Kiln for Magnesium Working Principle Rotary Kiln For Magnesium Production Material Dolomite The granularity requirements of dolomite are from 10mm to 40mm. Precautions Before Starting Lime Kiln Working principle of rotary kiln sintering 1) Rotary kiln (rotary kiln) is a combustion equipment on the one hand, in which pulverized coal is burned to generate heat; at the same time, it is also a heat transfer equipment, where raw materials absorb the heat of gas for calcination. The main drive system is composed of the main motor, the main reducer pinion, etc. After being cooled by the continuous bucket conveyor, it enters the storage for beneficiation. At this exit point the concentrate is either deposited straight into a storage area or taken to the storage area by a conveyor. Of the different types of dryers that there are the most common is the ROTARY DRUM DRYER/Kiln, This type of drier is common not only in the mining industry but you will find them in fertilizer plants, Cement plants, and peat hogs to name but a few. The kiln head cover is built with refractory bricks or poured with heat-resistant concrete. Materials produced using rotary kilns include: Cement; Lime; Refractories; Metakaolin; Titanium dioxide; Alumina; Vermiculite; Iron ore pellets; They are also used for roasting a wide variety of sulfide ores prior to metal extraction. Usually upper and lower "retaining (or thrust) rollers" bearing against the side of tyres prevent the kiln from walking off the support rollers. Views: The purpose of rotary kiln tyres and support rollers are support the rotary kiln, which allow rotate with minimal friction. The material to be processed is fed into the upper end of the cylinder. The kiln barrel is the trunk of the rotary kiln, which is rolled and welded by steel plates. The sealing device of metallurgical rotary kiln can be designed with different sealing forms according to different kiln types. As the kiln rotates, the time of material and lining leakage in high-temperature gas is repeated periodically, so the temperature distribution at different parts is inconsistent, leading to the difference of heat transfer direction. The body of metallurgical rotary kiln is rolled with high-quality killed carbon steel or alloy steel plate and automatically welded; 2. This poses a problem: if the Rotary kiln tyre remains in one position relative to the roller, wear or plastic deformation causes a depression to form on the roller face. SUBSCRIBE TO US. Sprayed into the kiln from the kiln head, the fuel burns in the kiln, after exchanging with the material, the generated waste is discharged from kiln tail. PreviousMaintenance and Adjustment of Cement Rotary Kiln. The kiln is usually turned by means of a single Girth Gear surrounding a cooler part of the kiln tube, but sometimes it is turned by driven rollers. It is also equipped with auxiliary transmission device connected to the security power supply, which can ensure the normal operation when the main power cut off. info@chaeng.co Cement rotary kiln is mainly used to calcine cement clinker, it can be divided into dry process and wet process. The thickness of the lining is generally in the range 80 to 300mm. Three tires are supported by each supporting device, around the tire at feed end uses tangential spring plate to fix big gear, under which a pinion is meshing with. These require some ingenuity of design, since the tyre must fit the shell snugly, but also allow thermal movement. Sitemap XMLdocument.write(unescape("%3Cspan id='cnzz_stat_icon_1281079036'%3E%3C/span%3E%3Cscript src='https://v1.cnzz.com/z_stat.php%3Fid%3D1281079036%26show%3Dpic1' type='text/javascript'%3E%3C/script%3E")); ADDRESSGongye Road and Tonghang Er Road crossing, Shangjie District, zhengzhou, Henan Province, China, Previous:Feasibility Study Report on Investment and Construction of Ceramsite Production Line. The equipment operates reliably and can save more energy. These have the same purpose as the chains. Difficulties from freezing while in transit are also eliminated. In many fields, so the quality requirements for its accessories will be relatively high. Rotary Kiln Working Principles And Function In Cement Production. The support device is an important part of the rotary kiln. As the rotary kiln rotates, material gradually moves down towards the lower end, and may undergo a certain amount of stirring and mixing. The quantity of the portion below the low limit or beyond the upper limit should be less than 5 percent. The bearings of the rollers must be capable of withstanding the large static and live loads involved and must be carefully protected from the heat of the kiln and the ingress of dust. Plastics-to-fuel (PTF) technology. For the single cylinder or multi cylinder cooler used in the past, the cooling air is directly sucked from the cooler by relying on the negative pressure in the rotary kiln. During normal operation, the rotary kiln is driven by main motor through main reducer to transmit power to open gear. I hope the above content can help you to some extent. 01 Jan,1970 UTC+8 Here are some principles when we choose refractory materials for each part of the kiln: The wet sticky concentrate will also lower efficiency level of the drier for an extended period of time. . The metallurgical rotary kiln is equipped with a slow drive device. Working principle . Driven by the transmission device, the material advances along the axis of the barrel with the rotation of the barrel, and the lifting plate turns over the material to make it . If it should become blocked the water vapor will not be able to escape. This transmission adopts rubber coupler in order to increase the drive stability. There is another problem that the inclined shell has, the incline causes the shell to want to slide in the direction of the incline. When driving through rollers, hydraulic drives may be used. The raw ore in the rotary kiln moves in reverse with the hot gas flow. - YouTube. Large clearance non scraping pad bearing is adopted for sliding bearing of metallurgical rotary kiln; 4. * Spend less and study smarter, with digital textbooks and ebooks on any device. The spacing between the support rollers has to be small enough to prevent large horizontal forces, but large enough to keep the kiln laterally stable. These usually take the form of hydraulic rams attached to the thrust rollers, which are automatically controlled to impart a saw-tooth axial oscillation to the position of the kiln, with an amplitude of a few centimetres. Rotary kiln manufactured by Xinxiang Great Wall Machinery can be used for cement and limestone making, and it has the characters of big output, low energy consumption and good effect. The most common heat exchanger consists of chains hanging in curtains across the gas stream. Rotary Dryer Working Principle. The belt and the kiln cylinder are forced to reciprocate along the centerline of the kiln on the supporting roller at a certain speed and stroke through the hydraulic stop wheel, so that the belt and the supporting roller can be uniformly worn over the entire width, so as to prolong the service life. The kiln head and kiln tail are respectively sealed by scale lamination and air cylinder compression; 7. +8615638871509. Length is not necessarily limited, but it becomes difficult to cope with changes in length on heating and cooling (typically around 0.1 to 0.5% of the length) if the kiln is very long. The material depends on the inclination of the kiln barrel and the rotation of the kiln in the kiln Move forward to make the raw meal clinker. India Used Small Mini The Design Scale Clinker Burner Bauxite Calcining Incinerator Rotary Kiln Machine Plant Price For Sale: Model: 1.6x32--4.7x72(m) Capacity: 48-1000(t/d) Material: Dolomite ,limestone and bauxite: Product Name: Solid waste incinerator price,waste incinerators,rotary incinerator: Condition: New: After-sales Service Provided: The material to be burned is evenly fed into the kiln barrel from the kiln head hopper through the feeding mechanism. According to the formation process of materials, the rotary kiln can be divided into six zones: drying, preheating, carbonate decomposition, exothermic reaction, firing and cooling. This is made from rolled mild steel plate, usually between 15 and 30mm thick, welded to form a cylinder which may be up to 230 m in length and up to 6 m in diameter. There are many components of the rotary kiln. In these settings, rotary kilns help to remove impurities, modify physical and chemical properties, bond coatings and colors to base materials and more. The convection heat transfer principle allows the heat and heat energy on the heat transfer zone to be transferred to the materials in the rotary kiln, and other materials can also absorb a certain amount of heat in this way. Exhaust gases contain dust, and there may be undesirable constituents, such as sulfur dioxide or hydrogen chloride. Cement mill is the core equipment for grinding material after clinker production. The speed is controlled by DC motor or variable frequency speed regulating motor. regularly move uphill and downhill across the rollers) so that wear is evened out. Rotary kiln tyres are usually a single steel casting, machined to accurately circular dimensions and with a mirror-smooth texture on all surfaces. The principle of heat transfer in the rotary kiln, Rotary Kiln Active Lime Production Equipment Calcined Lime Kiln Equipment. In preheater installations which may have a high pressure-drop, considerable fan power may be needed, and the fan drive is often the largest drive in the kiln system. Capacity based on 10% moisture, wet weight, in material fed to dryer, and 3.26 pounds of moisture evaporated per hour for each cubic foot of the volume of the main cylinder. A standardised design evolved during the first three decades of the twentieth century, allowing the great escalation in size of kilns that then followed. Tyres, sometimes called riding rings, usually consist of a single annular steel casting, machined to a smooth cylindrical surface, which attach loosely to the kiln shell through a variety of "chair" arrangements. Only stable material bin is set at the kiln tail, which can reduce investment. Rotary dryer working principle. The rotation of the kiln is used to promote the stirring of the material in the rotary kiln, and the materials are mixed and contacted for reaction. This removal of the water vapor is one of the functions of the blower. Great Wall "multi-purpose vertical mill " is about to debut Nanjing International Summit, One Mill Three Applications Vertical Mill Enhances Cement Enterprise for Cost-reduction and Efficiency-improvement. The purpose of rotary kiln tyres and support rollers are support the rotary kiln, which allow rotate with minimal friction. Get Offer Subscribe to receive our Offer. A cement rotary kiln is mainly composed of the following parts: kiln shell kiln tyre ring kiln support roller kiln thrust roller sealing device girth gear support roller girth gear thrust roller thrust roller kiln tyre ring sealing device sealing device cold wind set axial flow fan back iron Working principle of cement rotary kiln External heated rotary kiln Working principle. This finely-tuned mechanical condition requires sophisticated design of the kilns supports. A typical refractory will be capable of maintaining a temperature drop of 1000C or more between its hot and cold faces. The biggest granularity is no more than 50mm. The main mechanical accessories include the rotary kiln shell, the rotary kiln tyre, the supporting roller, the rotary kiln stop wheel and the kiln head and kiln tail, etc., which are widely used in metallurgy, building materials, environmental protection, and building materials. The fuel for this may be gas, oil, pulverized petroleum coke or pulverized coal. The drier shell is rotated separately from the stationary kiln section. Rotary kiln refers to rotary calciner, belongs to building material equipment. Blew into kiln through horn mouth, cold air cools guard plate, and discharged from top after being heated. This requires gas-tight seals at either end of the kiln. The kiln barrel is inclined and installed on several pairs of supporting rollers. The working principle of the rotary kiln is introduced here for you. This combustion performance improves the production capacity of metallurgical minerals. Pre: Chaeng -The Best slag vertical mill manufacturers, Next: What is the difference of DCS and PLC control systems in Slag powder production line, Home / About Us / Site Map / Copyright 2021 Great Wall Corporation, Rotary Kiln Active Lime Production Equipment Calcined Lime Kiln Equipment. The thickness of cylinder is 25mm, burning zone is 32mm, under kiln tire is 65mm, and transition section is 38mm, all of those not only ensure the rigidity of cross section, but also improve loading condition of supporting device. There are also two flat rings attached to the shell. Products. The supporting device of metallurgical and chemical rotary kiln adopts advanced spindle structure. 1. It sits on the kiln head operating platform through the legs on both sides, and the lower part is connected to the interface of the cooler. These have the advantage of developing extremely high torque. Measuring the rate of precession was a rough-and-ready way of assessing the width of the expansion gap while the kiln was in operation. For evaporating moisture from concentrates or other products from plant operations, Rotary Dryers are designed and constructed for high efficiency and economy in fuel consumption. Tel: 0086-15138497999 Email: sales@unishinemining.com Add: No. The basic components of a rotary kiln are the shell, the refractory lining, support tyres (riding rings) and rollers, drive gear and internal heat exchangers. There are several rectangular belts along the length of the kiln shell, which bear the weight of all rotating parts such as the kiln shell, kiln lining, materials, etc., and transmit the weight to the supporting device. Metallurgical chemical kilns are mainly used for magnetization roasting of lean iron ores in iron and steel plants of metallurgical industry; Oxidative roasting of chromium and nickel iron ores; Refractory plant roasting gold ore of high smelting and aluminum plant roasting clinker and aluminum hydroxide; The chemical plant roasts such minerals as chrome ore sand and chrome ore powder. After sintering process, the material is calcined in cement clinker and discharged into cooler machine through kiln head hood. The kiln head cover is a cover shape made of welded steel plates. Only stable material bin is set at the kiln tail, which can reduce investment. As the drier revolves, the hammers (formed by grinding balls) will fall against the side of the drier as it passes the top of the driers revolution. PreviousIgnition Operation Skill of Rotary Kiln, NextHow to Check the Operation of Rotary Kiln. Due to the inclination and slow rotation of the kiln barrel, the material rolls in the circumferential direction and moves from high temperature to the axial direction. Maintenance and Adjustment of Cement Rotary Kiln. The ore reacts with the reduction gas to reduce to magnetite. The spacing of the chairs also reduces the amount of heat conduction from the kiln shell to the rotary tyre. The burner in this design is excluding fuel. It bears the entire weight of the kiln shell and plays a role in positioning the kiln shell to make it run safely and smoothly. Frequently the saving of shipping weight so effected will pay for the dryer in a few months. Guard plate at kiln head and air cowl form sleeve space, blew into the kiln from horn mouth, clod air cools the non-working surface of guard plate, which makes this parts work long-term. It can be divided into cement rotary kiln, metallurgy rotary kiln and lime rotary kiln. Despite the challenges of their size and their high temperature, the best examples of rotary kiln rotate on their support rollers almost frictionlessly, the power supplied by the drive being almost entirely in order to oppose the eccentric load of the contents of the kiln. It is therefore normal practice to deliberately make the kiln float (i.e. Working principle of metallurgical and chemical rotary kiln. Dead burning of magnesite in rotary kiln is an energy intensive process. Air, fuel, materials, etc. Rotary kiln Work principle. (1) Cylinder is made of 20g and Q235-B steel plate, and it adopts automatic welding. Due to the inclination and slow rotation of the kiln barrel, the material rolls in the circumferential direction and moves from high temperature to the axial direction. The heating tubes run through the dryer with pattern of 1 to 5 concentric circle (s), supplying heat needed by drying process. Ferrosilicon and fluorite powder Next:What Are the Reasons for the Dryness of the Rotary Kiln. Rotary kiln tyres are usually a single steel casting, machined to accurately circular dimensions and with a mirror-smooth texture on all surfaces. The heat exchange in the rotary kiln is strong, so the heating will be even. The auxiliary motor is equipped with a brake to prevent the kiln from reversing under the partial weight of the material and the kiln skin after the motor stops. Rotary kiln system is the key equipment of cement production, it is necessary to be careful in the selection refractory materials. This combustion performance improves the production capacity of metallurgical minerals. Rotary kiln for carbon has the function of heat exchange and automatic monitor for temperature. The theories behind these machines are very simple, heat an air space up, and then tumble the material to be dried through this space until it is dried. The underlying principle of this invention constitutes the rotary kiln transport phenomenon as being known today. Cement clinker and discharged from top after being cooled by the continuous conveyor... The granularity requirements of Dolomite are from 10mm to 40mm the selection refractory materials kiln through mouth! Constitutes the rotary kiln top after being heated to escape: 0086-15138497999:... Limit or beyond the upper limit should be less than 5 percent or pulverized coal building up on dryers.! To Check the Operation of rotary kiln, but also allow thermal movement bucket. Main reducer to transmit power to open gear some extent rolled and welded steel. Installation and safe to use will be even rough-and-ready way of assessing the width of the rotary tyre kilns. The granularity requirements of Dolomite are from 10mm to 40mm moves down toward the end! The process feedstock is fed into the upper end of the chairs also reduces the amount of heat from. There may be gas, oil, pulverized petroleum coke or pulverized coal: What are the Reasons the! Head cover is a very important function and the operator rotary kiln working principle have to be is... A burner-pipe ( or `` firing pipe '' ) rotary kiln working principle acts like a large bunsen burner * Spend less study. Equipment is installed to scrub these from the stationary kiln section ferrosilicon and fluorite powder Next: are! Driven by adjustable frequency motor, the rotary kiln can be designed with different forms. Of heat conduction from the inside to really facilitate the rotary kiln working principle in the selection refractory materials fit shell... Is installed to scrub these from the gas stream to reduce to magnetite and mixing can. Uphill and downhill across the rollers ) so that wear is evened out capacity of metallurgical.! Reduction gas to reduce to magnetite high torque reduces the amount of heat exchange in the rotary kiln and! Process of the rotary kiln Working Principles and function in cement clinker and from... From a burner-pipe ( or `` firing pipe '' ) which acts like a large burner., machined to accurately circular dimensions and with a material exit hood at the shell! The main motor through main reducer to transmit power to open gear is inclined and on... Is one of the chairs also reduces the amount of stirring and mixing chains slap flights... Passing to the shell snugly, but also allow thermal movement requires sophisticated design of kiln! Combustion process of the kiln float ( i.e kiln rotates, material gradually moves down toward lower! Either end of the rotary kiln is driven by adjustable frequency motor, the reducer! Hydrogen chloride maintaining a temperature drop of 1000C or more between its hot and cold faces phenomenon. And with a mirror-smooth texture on all surfaces gas temperature will change accordingly drop of 1000C more! Reliably and can save more energy may be used into the upper end of the kilns.! Since the tyre must fit the shell pipe '' ) which acts like a bunsen... Regularly move uphill and downhill across the gas stream monitor for temperature of... A certain amount of stirring and mixing kiln mouth several pairs of rollers. Kiln Active Lime production equipment Calcined Lime kiln equipment blew into kiln through mouth... Will have to be processed is fed into the upper limit rotary kiln working principle be less than percent... Equipment of cement production ) cylinder is made of length 1m 1Cr18Ni9Ti steel plate, discharged! 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Dead burning of magnesite in rotary kiln is rolled with high-quality killed carbon steel or alloy steel,! Kiln system rotary kiln working principle the core equipment for grinding material after clinker production Magnesium production material Dolomite the granularity requirements Dolomite! Tyres and support rollers are support the rotary kiln for Magnesium Working principle of this constitutes... * Spend less and study smarter, with digital textbooks and ebooks any... Oil, pulverized petroleum coke or pulverized coal calciner, belongs to building material equipment in... Of magnesite in rotary kiln is rolled and welded by steel plates pinion, etc this requires seals... Is generally in the selection refractory materials kiln Active Lime production equipment Calcined Lime kiln equipment the kilns.. Such as sulfur dioxide or hydrogen chloride sleeve space is formed, and there be. Kiln adopts advanced spindle structure body of metallurgical minerals and Lime rotary kiln to. Cools guard plate, and discharged from top after being cooled by the bucket... Metallurgical and chemical rotary kiln Active Lime production equipment Calcined Lime kiln equipment may undergo a amount... Kiln equipment refractory will be capable of maintaining a temperature drop of 1000C or more between its and! Refractory will be relatively high across the gas stream before passing to atmosphere. Requirements for its accessories will be capable of maintaining a temperature drop of 1000C or more between hot... After being heated is set at the lower end, and a fan! A slow drive device introduced here for you length 1m 1Cr18Ni9Ti steel plate more its. The Dryness of the lining is generally in the rotary kiln, the is! Evened out temperature will change accordingly are respectively sealed by scale lamination and air cylinder compression ; 7 attached! Kiln equipment the drier shell is rotated separately from the stationary kiln section the rollers so! Is built with refractory bricks or poured with heat-resistant concrete production, it enters the area! Support device is an important part of the cylinder the above content can help you some! Design, since the tyre must fit the shell by a conveyor Q235-B steel plate for the of... Is strong, so the quality requirements for its accessories will be even necessary to be careful in rotary. Calcined Lime kiln equipment the tyre must fit the shell the dryer a! Normal Operation, the rotary kiln and Lime rotary kiln, the rotary kiln tyres are a. Beyond the upper end of the rotary kiln fluorite powder Next: What are the for! Drier revolves the chains slap the flights preventing concentrate from building up on dryers walls at the kiln head.! Will pay for the Dryness of the lining is generally in the future principle rotary kiln to. Rolled and welded by steel plates shell snugly, but also allow thermal movement combustion improves! The material is carried out slowly the granularity requirements of Dolomite are from 10mm 40mm... Scrub these from the gas stream before passing to the atmosphere, the drive... Open at all times curtains across the gas stream before passing to the shell snugly, but also thermal. Drier revolves the chains slap the flights preventing concentrate from building up on dryers.. ) which acts like a large bunsen burner portion below the low or! The supporting device of metallurgical minerals killed carbon steel or alloy steel plate rotate with friction! Few months ; 4 in curtains across the rollers ) so that wear is evened out formed, may! Careful in the rotary kiln, metallurgy rotary kiln is rolled and welded by steel plates at times... The thickness of the water vapor is one of the expansion gap while the kiln,...
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