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rotary kiln rotary kilns rotary cement kiln rotary kiln dryer

zhengzhou taida drying equipment co.,ltd

zhengzhou taida drying equipment co.,ltd

Sludge lime disposal project in Yanjiao sewage plant Yanjiao sewage treatment plant is located in the southwest of Yanjiao Development Zone. The project site is located in Yanjiao sewage plant in the n...

Brief introduction of process flow 1.Collection and transportation of sludge: trained personnel to clients collected sludge with iron and space bag packaging, and by the special transport of dangerous ...

cement kiln-rotary kiln,rotary dryer_hongke heavy machinery co.,ltd

cement kiln-rotary kiln,rotary dryer_hongke heavy machinery co.,ltd

We are a professional rotary kiln manufacturer in China, providing flowchart and installation service. According to different fuels, rotary kiln can be classified into gas-fired rotary kiln, oil-fired rotary kiln and coal-fired rotary kiln. It is widely used for different materials with a processing capacity of 180-1, 000 tons per day, a dimension of2.540m-4.868m and cement production capacity of 50-1000t/d, being easy to operate and durable in use.

As a kind of rotary kiln, cement kiln is mainly used for calcining cement clinker and is the main equipment of the new dry type cement production line. This equipment is mainly composed of cylinder, supporting device with catch wheel, transmission device, lubrication device, mobile kiln head and sealing device at the end of the kiln and it has the advantages of simple structure, reliable operation and easy control of the production process.

This type of rotary kiln has advanced pre-heating system which can accelerate the speed of the kiln and improve the output of unit volume. The sealing effect of this system is perfect and may realize the full utilization of the waste heat. The dust elimination is simple, convenient and effective with high quality of the clinker and low consumption of heat.

Pulverized coal (natural gas) used for internal combustion in rotary kiln can heat the materials by using gaseous conductance or radiation during the heating process. With the constant rotation of the cylinder at the same time according to the designed inclination and rotational speed, the raw materials also can be periodically rolled and moved forward inside the kilns so as to be sent from the feeding end to the discharging end and calcine it to be qualified for clinker in the time period when they go through rotary kiln, thus achieving the aims of high yield, top quality and low energy consumption.

design features of rotary kilns-rotary kiln,rotary dryer_hongke heavy machinery co.,ltd

design features of rotary kilns-rotary kiln,rotary dryer_hongke heavy machinery co.,ltd

Rotary kilns systems have evolved considerably in form and complexity over the last 120 years, but the kilns themselves have certain common features. This page lists these and describes their evolution.

The shell of the kiln is made of mild steel plate. Mild steel is the only viable material for the purpose, but presents the problem that the maximum temperature of the feed inside the kiln is over 1400C, while the gas temperatures reach 1900C. The melting point of mild steel is around 1300C, and it starts to weaken at 480C, so considerable effort is required to protect the shell from overheating.

Riveted construction continued until WWII. The technique of making welded joints in such heavy plate by arc welding developed in the USA. As in the shipbuilding industry, welding was adopted only rather slowly in the UK. Welding has the obvious advantage that a lighter construction is possible, without the extra weight of the straps. Kiln suppliers began to use welding after WWII, but on-site assembly continued using rivets because of the lack of the required skill at cement plants. Typically sections of length up to about 10 m - the longest that could be moved by road - were welded, then riveted together when in place.

Finally, from the late 1950s, all-welded kilns were installed. Although welded construction reduced the weight of kilns, it had the distinct disadvantage that the shell, without the reinforcement of thick straps, became somewhat less rigid, despite the adoption of thicker plate (25-35 mm).

All rotary kilns essentially take the form of beams supported at a few points - the tyres - along their length, with the added complication that they rotate. The shell has to cope with all the forces involved, but is necessarily thin, since weight must be minimised. The design and maintenance of the kiln need to keep the distortion of the structure within acceptable limits. Flexure as the kiln rotates causes reduction in the life of the refractory lining (see below) as well as fatiguing the shell itself.A number of different mechanical deformations occur. Diagrams show the nature of the distortion in an exaggerated form.Bending of the kiln under gravity:Axial distortion the tendency of the kiln to sag between two successive tyres (fig. 1)Transverse distortion (ovality) the tendency of the kiln to flatten, mainly in the vicinity of the tyre (fig. 2)Distortion due to damage:Blistering usually due to local over-heating (fig. 3)"Waisting" or "necking" usually due to the shell expanding beyond the limit of the tyre clearance (fig. 4). This typically happens if the shell temperature rises more than 180C above design temperature in the vicinity of the tyre.Banana distortion usually due to over-heating one side of the kiln during a crash-stop (fig. 5)Structural defects:Misalignment vertical displacement of the rollers from their correct positionKinks and dog-legs off-axis defects during assembly or maintenance of the shellTorsional distortion the twisting of the shell caused by the torque of the drive a very minor effect.Thermal expansion the kiln shell expands radially and longitudinally. Radial expansion closes up the clearance within the tyre, so reducing ovality. Longitudinal expansion affects the location of the tyres with respect to the rollers and of the ends of the kiln with the hood and exhaust duct. The kiln system, of course, is designed to take up its correct position when operating at design temperature. Since the 1930s kilns have been designed to expand 0.25-0.3%. Earlier kilns probably expanded more than this.The axial and transverse distortions are the main concern: distortion due to damage and structural defects tend to amplify their effects.The axial flexure is greatest at the tyre, and increases with the span (relative to kiln diameter) between tyres. This is mitigated by extra layers (wrappers) of plate under the tyres.Ovality affects both the tyre and the shell, but is much greater for the latter because of its thinness, and increases with the ratio of kiln diameter to shell thickness.

The most recent precalciner kilns, because most of the processing is done in the preheater, can have very low length/diameter ratios (<14) and this re-introduces the possibility of mechanically simplified two-tyre kilns. Splined tyres are combined with self-aligning roller assemblies and through-the-roller drives (see below), allowing the system to continue to function even if the kiln is bent. This has been adopted for the kilns at Rugby, Ballyconnell, Kinnegad, Tunstead and Platin.If a kiln has length 14D and has two tyres located at 25% and 75% of the length, then the span between the tyres is 7D, which is about the practicable limit. The Kinnegad kiln has a girth-gear drive.

The hood receives direct radiant heat from the white-hot clinker and refractories and the flame, and so is refractory lined for protection from this. It also needs to be strongly constructed to cope with pressure variations that may occur. On the other hand, there is a need to gain access to the kiln for maintenance of the refractories. This was particularly the case during the experimental first decade of the twentieth century, when the service life of refractories was often very short. For this reason, from the first patents onward, the kiln hood was mounted on wheels or rollers so that it could be rolled back from the kiln nose. The need to do this later became a reason for restricting the size and cross-section of kiln hoods.

A significant step-change in hood design came with the Fuller grate cooler patent, which put heavy emphasis on the speed of cooling of the clinker and the aerodynamics of the secondary air. This led to the installation of deeper hoods, and the escalation of both hood depth and kiln diameter led to the abandonment of moveable hoods in the early 1960s. Modern large hoods have doors in the front large enough for small vehicles to enter the kiln.

For maximum thermal efficiency, modern kilns use a relatively small amount of cool primary air through the firing pipe, and coolers produce secondary air at high temperature, so hoods are carefully aerodynamically designed to ensure that the secondary air envelopes the flame in a manner that optimises combustion.The use of the hood as a view-point for the operator was essential in early practice. The peak temperature of the feed in the front of the kiln is critically important, since a fall in temperature causes the free-lime content to rise rapidly, and clinkering (i.e. sintering) may cease altogether, causing fine feed to rush forward into the cooler. On the other hand, too high a temperature is liable to cause loss of coating and damage to the kiln. Although various kinds of pyrometer for temperature measurement have been available throughout the history of rotary kilns, it can be safely said that they were not an effective means of control until the end of the twentieth century. The sole control of temperature was the expert eye of the operator. Criteria were the colour and brightness of the clinker, the height to which the clinker climbs the kiln wall (which is related to the amount of liquid formed) and the position where clinkering starts. The control panels were therefore located on the firing floor and the operator interspersed scrutiny of the instruments with frequent visits to the kiln hoods to monitor progress. Cement plants stood or fell by the round-the-clock expertise of their kiln operators.From the late 1960s, instrumentation started to improve, and the operators reliance on visual information was aided by TV cameras mounted on the hood inspection ports. This led to the possibility of centralised control rooms remote from the kiln. More modern cameras are provided with infra-red sensitivity and the image is processed to show colour-coded temperature. Modern firing floors are usually deserted unless something has gone wrong.

rotary kiln and dryer - cement rotary kiln - rotary kiln dryer | agico

rotary kiln and dryer - cement rotary kiln - rotary kiln dryer | agico

When it comes tothermal processing, how do you know if you need a rotary kiln or a rotary kiln dryer? Though both of them have almost the sameappearance and share similar thermal processing principles, there are essential differences between the two products. In addition to the slight difference in structure details, appearance, and technological design, they are used in very different applications.

In the cement industry, rotary kiln and dryer are commonly used cement equipment in cement plants, which play a very important role in the stage of clinker calcination and raw material preparation respectively. In principle, they all play a role in drying materials by using high temperatures, but their purposes are different. While cement rotary kiln can dry materials, but its main concern is not drying, but heating.

One of the essential differences between the cement rotary kiln and dryer is that the cement rotary kiln can withstand a higher temperature than rotary kiln dryer, operating between 800-1300, while in the rotary kiln dryer, the heating temperature is only about 300.

Both cement rotary kiln and rotary dryer rely on the heat transfer between the material and hot gas to realize drying, while the special internal structure of rotary kiln makes it able to withstand a higher temperature than the dryer, like direct fired rotary kilns, their inwall is lined with refractory lining bricks or castable interior. This design protects the cylinder from high-temperature damage. The indirect fired rotary kilns do not have the protective refractory liner so the shell of the cylinder should be made from high-temperature resistant alloy, not steel.

As we mentioned above, the heating temperature of the rotary kiln dryer is low, it is not necessary to arrange high-temperature resistant lining in the cylinder, so various internal components can be installed to improve heat transfer. One of the most common internal components is flight plates. They are installed on the wall of the cylinder and rotate continuously with the cylinder body, lifting the materials and then sprinkling them so that the material can fully contact with the hot gas, conduct heat and achieve the purpose of drying.

Although there is some overlap between the functions of rotary kiln and dryer, they are usually used for different purposes. Rotary kiln dryer is a heat transfer device applied in low-temperature applications. It is capable to reduce the water content of raw materials. In the cement production line, a rotary kiln dryer is an indispensable device in the material preparation stage. In order to ensure a high-efficiency of the grinding mill and the quality of cement products, it is necessary to dry the excess water before grinding clay, coal, and other raw materials. On the contrary, the cement rotary kiln is mainly used for high-temperature applications, the purpose of which is to cause physical changes or chemical reactions of materials. Different from the rotary dryer, cement rotary kiln is usually set in the clinker calcination stage of the cement production line. Raw materials are heated by the rising temperature in the kiln cylinder and then cooled to form the clinker after reaching a boundary point.

Many raw materials calcined in rotary kilns will undergo both physical and chemical changes, such as limestone. When it is heated by extreme high-temperature in cement rotary kiln, a series of physical changes (water evaporation) and chemical reactions (calcium carbonate decomposes into calcium oxide) will be triggered. This process realizes the convert of material properties, which we usually say a new product is created. However, the rotary dryer can only evaporate the moisture inside the material, turning the wet material into the dry material, and the material essence has not changed.

The diameter ratio and length ratio of cement rotary kiln are generally more than 10, while the dryer is less than 8. Therefore, the cylinder body of rotary kiln is mostly long and thin, the rotary kiln dryer is relatively thick and short.

The steel plate used in the production of cement rotary kiln is much thicker than that used in the dryer, so the rotary kiln is relatively heavier. Besides, both of the two machines adopt the supporting roller device, while the roller equipped on the rotary kiln is obviously heavier than that of the dryer.

AGICO has been a leading manufacturer for the cement rotary kiln and rotary kiln dryer industries for many years.We offer one-stop service capable of fabricating kilns and dryers of all sizes, as well as providing other kinds of cement equipment used in cement plants. For more information on cement plant equipment, please contact us!

AGICO Group is an integrative enterprise group. It is a Chinese company that specialized in manufacturing and exporting cement plants and cement equipment, providing the turnkey project from project design, equipment installation and equipment commissioning to equipment maintenance.

rotary kiln dryer - cement dryer | agico cement rotary dryer

rotary kiln dryer - cement dryer | agico cement rotary dryer

Therotary kiln dryer (rotary dryer)is a type ofcement dryeremployed to reduce themoisturecontent of cement raw materials. It works by drying materials through high-temperature gas in a rotating and slope drum.

In the cement industry, no matter using dry or wet methods to produce cement, all kinds of water containing raw materials, coal and mixed materials need to be dried to ensure the normal operation of the raw mill. Because if there is much moisture in the material, it will adhere to the grinding media and lining plate of the grinding mill, which will reduce the grinding efficiency and bring difficulties to the operation and quality control. Besides, the quality of cement products is also affected. Therefore, the drying process is an essential link in cement production, and the cement dryer is also important cement equipment.

AGICO Cement is a professional and experienced cement plant equipment supplier in China. The rotary dryers produced by us can meet all your unique processing cement materials. Besides, we offer customization service, whether you require short or long residence times, low or high gas temperatures, wide or narrow cylinder diameter, counter flow or parallel flow, we can meet it.

Cement dryer is a kind of drying equipment for handling large quantities of bulk materials. A steady running of the equipment can not only ensure normal production but also appropriately extend the service life and reduce the production cost. Therefore, regular cleaning and maintenance of the dryer are necessary and helpful to find out problems in time, solve potential faults, reduce downtime and ensure stable production.

AGICO Group is an integrative enterprise group. It is a Chinese company that specialized in manufacturing and exporting cement plants and cement equipment, providing the turnkey project from project design, equipment installation and equipment commissioning to equipment maintenance.

rotary kilns vs. rotary dryers: whats the difference?

rotary kilns vs. rotary dryers: whats the difference?

When it comes to thermal processing, how do you know if you need a rotary kiln, or a rotary dryer? Though these two products share similar thermal processing principles, they are used in very different applications. While rotary kilns can dry a product, their main concern is not in drying, but simply heating.

Rotary dryers are almost always used for drawing moisture out of a material. Typically, they operate at temperatures between 800 1400F. Rotary kilns, however, are concerned with causing a chemical reaction. Therefore, they need to operate at much higher temperatures, between 1000 3000.

Rotary kilns are designed to withstand much higher temperatures than a rotary dryer. Typically, if you are dealing with a direct fired rotary kiln, it is refractory lined with a brick or castable lining. This lining protects the steel shell. Rotary dryers are typically not lined, and their steel is not able to withstand such high temperatures. If you are dealing with an indirect rotary kiln, the kiln is not normally lined, so the shell of the drum has to be made out of a temperature resistant alloy instead of steel.

Whether you need a rotary kiln or a rotary dryer is all dependent on what you are trying to do with your material. Are you simply looking to dry your material via thermal processing, or are you trying to cause a thermally-driven chemical reaction? The difference between a rotary dryer and a rotary kiln is simple: a rotary dryer will dry your material, and a rotary kiln will heat it up to cause a chemical reaction.

cement rotary kiln, rotary kiln | cement kiln | agico cement

cement rotary kiln, rotary kiln | cement kiln | agico cement

Cement Rotary kiln, is one kind of lime kiln, belongs to building material equipment. The rotary kiln has wide applications, such as metallurgy, chemical industry, cement, refractory materials, lime, environmental protection and other industries.

Cement rotary kiln, also called clinker kiln, can be divided into dry-process cement kiln and wet-process cement kiln according to the cement production technology. Dry-process cement rotary kiln is mainly used to calcine cement clinker. As the core equipment of NSP cement production line, cement rotary kiln is consist of shell, supporting device, transmission device, lubrication device, moving kiln head, sealing device for kiln tail, burning device and etc. dry-process cement rotary kiln has advantages of simple structure, reliable operation and easy to automatic control in the cement production line.

AGICO Cement is one of leading cement plant manufacturers offers cement kiln and other cement equipment, our cement rotary kiln has been widely applied to many cement plant. Based on 60+ years experience and advanced production equipment, we can provide EPC project and custom-designed solution to cement manufacturing.

Cement rotary kiln is a piece of cement equipment with strong durability, also plays a vital role in the cement plant. If you find any problem in the operation, solve it immediately. In general, the maintenance of rotary kiln is a complex process, here are some tips will be helpful.

First of all, check the fire hole of the rotary kiln is closed or not, ensure the close state to avoid too much cold air. Then, check the windshield of the burner at the kiln door is close to the kiln door. If the air leakage is not closed, it should be pushed to the position of close contact with the kiln door. Third, check the door cover of rotary kiln, if there is the phenomenon of positive pressure ash, should inform the central control to adjust properly. Finally, remember to check air leakage or wear out the phenomenon of resistant material, when you find the above problems, promptly inform the relevant leadership to deal with them.

Check the fish scales sealed in the kiln head, and then check the fitting condition of the fish scales in the rotary kiln and friction ring. If there is any bad condition such as non-fitting, the weight should be adjusted by tightening the device to make it fit. If there is too much aggregate in the reliable rotary kiln, the discharging pipe should be adjusted timely. After that, check the wear condition of the friction ring of rotary kiln. If the friction ring is found to be badly worn or worn out, replace it.

Check the cooling air at the kiln head, and then check the friction between kiln head and the kiln door cover. In order to ensure safety, check the oil film contact of the supporting wheel shaft and thrust plate one by one. Check oil level, oil scoop and oil distribution of rotary kiln. Next, check whether there are impurities, water droplets, oil leakage, collision, loosening and other abnormal conditions, if necessary, the temperature can be measured and control.

The service life of rotary kiln is affected by many factors, such as quality, regular maintenance, etc. AGICO CEMENT ensures the quality of the rotary kiln by strict quality control and advanced technology. Besides, regular maintenance can prolong the useful life of your rotary kiln.

Yes, in order to prevent cold air from entering the rotary kiln and smoke dust from spilling out of the cylinder, the rotary kiln is equipped with a reliable sealing device for the inlet end (tail) and an outlet end (head) of the cylinder, ensuring the sealing performance of the rotary kiln.

The cement rotary kiln produced by AGICO has been optimized and added with e dust filter products for environment protection, which is a new type of environmental protection equipment to reduce the environmental pollution caused by industrial production.

used used rotary kilns for sale. weilang equipment & more | machinio

used used rotary kilns for sale. weilang equipment & more | machinio

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