rotary dryer flame

rotary coal powder burnerzhengzhou taida drying equipment co.,ltd

rotary coal powder burnerzhengzhou taida drying equipment co.,ltd

Product introduction injection type coal powder burner is a kind of extension device of coal grinding powder spraying machine. At present, it is a kind of most special heating equipment. It adopts special air supply guiding structure with multinozzles which can effectively form trap heat of high temperature.

Injection type coal powder burner is a kind of extension device of coal grinding powder spraying machine. At present, it is a kind of most special heating equipment. It adopts special air supply guiding structure with multinozzles which can effectively form trap heat of high temperature. Exchange heat is carried out in radiation vortex method, which changes basically the combustion state of coal powder. It has following features: easy ignition; fast temperature elevation; coal powder will stay in high-temperature section for a long time; high burn-off rate; high thermal efficiency; air output and combustion input can be adjusted according to digital temperature control. it is very convenient to use. It can also eliminate smoke and save energy. By using this equipment, working conditions and environmental pollution can be reduced. The application of this equipment completely avoid the problem of difficult ignition, repeatedly preheating, constant preheating of combustion chamber, uneven coal powder which returns from fire flame dyke and incomplete combustion. Therefore, after using burner, it can save about 20% coal and improve 30% output.

Coal powder is a kind of new type kiln heating equipment with advantages such as high utilization efficiency, energy saving and environmental protection. It can be applied to various annealing furnace, metal heating furnace, glowing furnace, precision casting shell furnace, melting furnace, foundry furnace and other relevant furnaces. Coal powder burner has a specially designed multi-class and multi-nozzle air supply guiding structure. It can make coal powder produce high temperature eddy current. It is characterized by high utilization efficiency, dust elimination, energy saving, good working condition and less labor force. As an ideal product for energy saving and environmental protection, it is popular among many customers. 1.According to aerodynamics, fluidics and combustion mechanism in different conditions such as coal quality, granularity and temperature, it improves the size, air passage and coal passage of combustion chamber reasonably. Coal powder mixes in evenly and burns fully in combustion chamber. The flame injected is characterized by high temperature, strong fire, coal saving and no pollution. 2.The time used for temperature increase is shortened; the thermal efficiency is high; low request for coal quality; can adapt to wide range of coal; high economic efficiency; 3.Easy to ignite; temperature can raise very quickly; working efficiency is greatly increased; 4.Air amount supplied and coal amount assumed can be adjusted by real demand; the temperature of furnace and length of flame can be adjusted in a wide range to meet real need; 5.The temperature in the burner is very even; the area which is heated is very large; furnace slag will not be stick on the surface work piece; good quality of products; 6.We have cooperated with many refractory materials factories for practices and tests; the service span is 3 to 6 times of that in similar products; 7.It can be used for production for constant 24 hours; it is no need to clean everyday;

Coal powder (under 25 mm) is crushed first; then, coal powder is injected into combustion room of host by metal pipe nozzle and is burnt by oil; meanwhile, blower will send air to combustion room by annular rotating duct at rear cover of host; air will cling to inner wall and rotate for absorbing hot flue gas which will strongly mix and burn with coal powder; hot flame is injected into drum of dryer for heating dry materials;

about - laboao

about - laboao

Zhengzhou Laboao Instrument Equipment Co., Ltd (LABOAO) is one of a leading company in China, involved in manufacturing and supplying scientific & laboratory equipment. Located in Zhengzhou City, Henan Province in China. We are a professional supplier of laboratory and medical equipment. LABOAO provide a wide range of products for educational institutions, pharmaceutical industries, chemical industries, life science and research laboratories etc. Our main products includes: Glass Reactor, Rotary Evaporator, Spray Dryer, Freeze Dryers, Autoclaves, Centrifuge, Chillers, Furnace, Flame Photometer, Spectrophotometer, Incubator, Oven, Viscometer, Laboratory Shaker, Microplate Reader, Kjeldahl Systems, Test Chambers, Clean Benches, CO2 Incubator, Ultrasonic Cleaner etc. We also provide many professional instruments for different industry, such as food industry, drug testing industry, coal industry, petroleum industry etc. All our products pass through numerous tests and undergo rigorous quality check during every phase of production and comply with stringent international standards. LABOAO is an ISO accredited company, and had certification for both ISO Quality Standard and CE standard. LABOAO company is mainly committed to export good quality product to the world. More than 12years export experience make us more professional. We are driven by continuous innovation and committed to provide reliable quality and competitively priced laboratory equipment.Superior Quality, Top Service makes LABOAO more reliable.

Our company has 352 employees and 130 R&D teams. More than 85% of the company's employees have more than three years of professional foreign trade experience. 10% of the annual sales are focused on product development and improvement. We believe that only excellent teams can High quality service is good for customers.

Our qualified specialists strictly realize the process comprehensive supervision based on our quality process control system, which contains products design, research and development, test, production, quality inspection and packaging.

Our product packaging has been proven over the long term and we usually have plywood boxes or cartons with trays. In order to save you transportation costs, we usually use cardboard boxes (small goods) or wooden boxes (large or heavy goods). We will arrange the appropriate packaging according to the weight and size of the goods. Of course, you can also choose the packaging form.

We strictly control the quality of our products and manufacture products in strict accordance with the national quality standards system and production guidelines. Our certificates include CE certificate, IOS 9001 certificate, SGS certificate, TUV inspection certificate and so on.

rotary dryers: when is a combustion chamber necessary?

rotary dryers: when is a combustion chamber necessary?

Rotary drum dryers are a central component in a wide range of industrial processes. These highly flexible industrial dryers can be configured to create a custom processing solution for optimal dryer performance.

While not necessary in every setting and still critical in others, combustion chambers offer several benefits that can contribute significantly to product quality and overall process efficiency. The following provides an overview on combustion chambers, including the many benefits they offer and when they are an essential add-on to the rotary dryer.

A combustion chamber consists of a static vessel (usually cylindrical), typically constructed from steel, with multiple air inlets for efficient combustion. A burner is mounted on the end of the combustion chamber, which is connected to the end of the dryer. The chamber is refractory lined to protect the shell walls from the high temperatures. A single shell is typical, but in some cases double shell designs are available to pre heat the air.

The combustion chamber is used to house the combustion reaction that feeds heat into the dryer, preventing direct contact between the flame and the material being processed. It can be used on either a co-current or counter-current design.

When a combustion chamber is not used, the burner is simply mounted directly onto the end of the dryer, so that the flame is present in the drum itself, allowing direct contact between the flame and the material being processed.

Some consider these two variations as subtypes of the direct dryer category; direct-fired, referring to when the flame is in direct contact with the material, and direct-heat referring to when the flame is kept away from the material through the use of a combustion chamber.

In some cases, depending on the product undergoing drying, a combustion chamber may be critical to the process. Products that are heat sensitive, flammable, or might break down under a flame, should not be processed in direct contact with a flame. Many materials are sensitive to heat and could break down or be damaged by flame, resulting in off-spec product and a high amount of attrition (the breakdown of product into fines and dust).

In cases where the material being processed is especially heat sensitive, the combustion chamber design can be used to reduce the amount of radiative heat transfer imparted on the material. For this, right angle designs are often employed, eliminating the direct path between the products of combustion and the material being processed.

Additionally, some materials, such as potash, will form undesirable pollutants if exposed to a flame, increasing the requirements of the air pollution control system and potentially presenting regulatory hurdles.

Combustion chambers are not always necessary. When product quality is not a concern and the presence of a direct flame does not produce any undesirable byproducts, producers can avoid the extra expense of a combustion chamber.

This is frequently seen in industries processing low-value products, such as asphalt or low-grade aggregates. The flame presents no problem to the material and essentially flashes off moisture by direct contact, reducing the required retention time.

The use of a combustion chamber promotes improved product quality. By preventing the material from being exposed to the flame, attrition is minimized and materials sensitive to heat are not over-exposed.

The inclusion of a combustion chamber also increases process control. Through the use of a combustion chamber and dilution air fan, the process gas temperature entering the dryer is more readily controllable, as well as more uniform. This enhanced control is often used to optimize the temperatures entering the drum according to the specific needs of the material being processed, while uniform heat yields more uniform drying results.

The ability to more readily control the temperatures entering the dryer improves overall process efficiency. Efficiency is further enhanced because dilution air can be incorporated into the process, promoting a more complete combustion of the fuel source and providing an outlet for recovered waste heat to be reused, reducing energy requirements.

As a result of the benefits that can be garnered, it is often desirable to retrofit an existing dryer system with a combustion chamber; many producers who initially opted to go without are finding themselves turning to combustion chambers to improve process efficiency, increase capacity, reduce pollutants, and/or improve product quality.

Combustion chambers are easily retrofitted onto existing rotary dryers; while space is often a limiting factor in incorporating additional equipment into a system, combustion chambers are flexible by design. Manufacturers can build combustion chambers to fit into a variety of different spaces. This might mean utilizing space above or below the dryer to direct combustion gases into the unit. The image below, for example, shows the custom ducting FEECO designed to allow the use of a combustion chamber on a separate floor from the rotary dryer at the customers plant.

Combustion chambers are essential to maintaining product quality and improving efficiency when drying material with a rotary dryer. They are not, however, necessary in all settings, and are often left off when product quality and pollutant byproducts are not a concern. Combustion chambers offer a range of benefits to industrial drying and are easily retrofitted onto existing dryer systems for improved efficiency.

FEECO is the worlds leading rotary dryer manufacturer. We can engineer a custom combustion chamber as part of a new dryer design, or for retrofitting an existing system. All FEECO combustion chambers are built to the highest quality standards and feature unique designs to maximize efficiency and combustion chamber lifespan. For more information on our combustion chambers or rotary dryers, contact us today!

rotary dryer design & working principle

rotary dryer design & working principle

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.Whenever possible to apply heat direct to the material to be dried, Rotary Dryers of the Direct Heating Design are used. If it is not possible to apply heat direct to the material to be dried, Rotary Dryers of the Indirect Heating Design can be furnished so that the heated gases will not come in direct contact with the material.

Rotary Dryer is a simple, inexpensive unit for reducing the moisture content of flotation concentrates, as well as chemical and industrial products. Frequently the saving of shipping weight so effected will pay for the dryer in a few months. Difficulties from freezing while in transit are also eliminated. Many industrial projects are now using Dryers for control and production purposes on many materials.

Three main types of Rotary Dryers can be supplied. The direct heat unit is used when it is permissible for the drying gases to come in direct contact with the material being dried. Partition plates increase the heating surface. Drying may be by hot air or exhaust gases from other operations. If this drying gas has a deleterious effect on the product, then an indirect type of dryer can be supplied. A further derivation is the Tedrow Steam Dryer.

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 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. All though it sounds simple there are problems that have to be solved before the required results are met. But first, so you know what we are talking about lets go through the design of a drier.

First is the KILN, this provides the heat, The BURNER is inside this portion. The fuel for the burner is usually diesel although heavy crude oil could be used in some cases. To be able to generate enough heat to dry the concentrate air must be added by way of a BLOWER. In front of the kiln is the point that the wet concentrate enters the drier. It is put into the revolving SHELL. The shell is on a slight incline. As the Concentrate is tumbled through the hot air mass of the drier it travels down this incline to the exit of the drier.

At this exit point the concentrate is either deposited straight into a storage area or taken to the storage area by a conveyor. It is also at this point that there is an EXHAUST HOOD. This provides a controlled escape passage for the fumes and water vapor that is generated by the concentrate drying. This is a very important function and the operator will have to be sure that it is open at all times. If it should become blocked the water vapor will not be able to escape. The concentrate will become wet and sticky which will result in the discharge plugging. The wet sticky concentrate will also lower efficiency level of the drier for an extended period of time. This happens because inside the drier shell are what are termed FLIGHTS these are flat pieces of metal that are bolted onto the shell.

They are there to lift the concentrate up to the top of the shells rotation and drop the concentrate through the hot air. If the water vapor isnt taken away, the concentrate becomes sticky from reabsorbing the water. This sticky concentrate will fill the spaces between the flights.

The concentrate will not be lifted and dropped through the hot air. This results in a long term condition of poor performance even after the initial problem has been cured. These flights will remain buried in concentrate. This removal of the water vapor is one of the functions of the blower. It assists the natural process of air movement as the hot air mass expands. To prevent the buildup of concentrate on the flights there are often CHAINS attached to them. As the drier revolves the chains slap the flights preventing concentrate from building up on dryers walls.

The drier shell is rotated separately from the stationary kiln section. To achieve the rotation a BULL GEAR is attached around the shell section. There are also two flat rings attached to the shell. These provide surfaces for support rollers to roll on. There is another problem that the inclined shell has, the incline causes the shell to want to slide in the direction of the incline. To prevent this additional rollers are attached to the last set of rollers.

rotary drum drying machine | reduce moisture | temperature resistance

rotary drum drying machine | reduce moisture | temperature resistance

Rotary drum drying machine is widely used in organic fertilizer making plants. Its main function is drying different kinds of fertilizer raw materials or final pellets into appropriate moisture content. The rotating drum dryer equipment is a kind of necessary equipment for all kind of organic fertilizer and compound fertilizer producing factories. Using it, the post management of fertilizer products can be much easier and efficient.

Our rotary drum drying machine consists of a rotary drum, lifting plates, transmission, support device and sealing ring. The dryer mainly is a slightly sloping drum. The fertilizer materials are added from the higher end, the hot flue gas and the material flow into the drum at the same time. With the rotating of the drum, the organic fertilizer materials will move to the lower end of the rotary drum.

There are many lifting plates on the inner wall of the drum, which can pick up and sprinkle the fertilizer materials down, so that the contact area between the materials and the airflow is enlarged to improve the drying efficiency. At last, the dried product flows from the bottom outlet to the next procedure.

1. High degree of mechanization brings it larger working capacity. Meanwhile, it consumes lower fuel and when working, it doesnt need people to operate. That can greatly reduce your cost on hiring operators. 2. Our rotary drum drying machine has good characteristics of high temperature resistance, that ensures the high temperature hot air can dry fertilizer materials quickly. And this kind of drying machine is much more efficient than the traditional dryers.

3. The distribution and angle design of the lifting plates are very reasonable, making the performance of the machine more reliable and the operation more stable. Therefore, it greatly improve the heat energy utilization rate and reduce the frequency of material cleaning. 4. It has excellent application to different fertilizer materials such as poultry manure, livestock, mushrooms, straw powder, saw dust and so on. No matter which kind of materials, our rotating drying machine can work well for you. 5. While the fertilizer materials are drying, our drying machine can also sterilize and deodorize them. That not only makes fertilizers with suitable moisture, but also makes them have better quality.

In wet granulation method fertilizer making line, the drying machine is very helpful to dry fertilizer granules. As we know, the raw materials granulated by wet granulation equipment always have high moisture. Before granulating, the materials always need to be dehydrated with about 30% moisture content by the solid-liquid separator machine. But this value is not suitable to the final granules. To bring granules more compact structure and improve their hardness, the drying machine is needed. After drying, its much easier to transport and store the fertilizer granules.

Fresh chicken manure always has high moisture content. Before making them into fertilizer, its very necessary to reduce the moisture content. If you have a small scale factory of making chicken manure fertilizer pellets, you can choose our small drying machine. It can dry 1-5 tons of chicken manure per hour, the power consumption is 7.5 kw/h. Unlike the solid-liquid separator machine reducing the manure moisture content to about 30%, it can dry chicken manure to a very low moisture content at one time. You can make the dried chicken dung into pellets directly by using dry fertilizer granulating machine. With it, the process of your small chicken litter fertilizer plant will be more simple, which can save you a lot of money.

For 5-12t/h complex fertilizer production line, we have medium capacity drying machine can work for you. Its can dry the final compound fertilizer granules. Our customers always use them for limestone, sulphur or npk fertilizer plants. With high working efficiency, it can bring the pellets better hardness, prevent the compound balls from caking. The fertility can be more stable.

We also have large size fertilizer dryer with capacity of 14-18t/h. Excellent working ability makes it only costs 45 kw power per hour. Moreover, our large drying machine is almost suitable for all kinds of fertilizer plants. Using high performance parts and metallic materials, it has stable structure and the revolutionary design prolongs its working life greatly.

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