The units of HDC series efficient wet centrifugal dust collection include fan blade, automatic slag discharger. As a result, this series of dust collector can be used constantly for many years without any large-scale maintenance.
Owing to its special inner structure and dust collection principle, there is no need to replace weary parts. So the dust collection efficiency is stable and reliable. There is no low-efficiency problem which is brought about by block of bag.
HDC series of efficient wet centrifugal dust wiper is made from high spefication hot rolled carbon steel. There is less movable parts. Under normal working conditions, it can run constantly for more than ten years.
If it is needed to change the dust wiping efficiency, you only need to change the water level. Accordingly, adjust the specification of air exhauster. Then, operator can finish improving or decreasing dust collection efficiency.
This 10 percent consist of fine particules and water moisture. The byproduct process seperates the dust particles from the water moisture. The dust particles are collected in the bottom of the collector to be processed and the clean water moisture is dispersed to the environment.
Industrial sands are employed throughout a variety of industries, showing up in our daily lives in everything from electronics to paint, each application requiring sand to meet precise chemical and physical specifications.
Industrial sands such as garnet and silica go through a myriad of processing stages upon mining in order to clean and refine the sand for its intended use. While this process varies depending on the end product, most applications require sand to be washed and dried.
Drying not only reduces the moisture content, improving the economics of shipping, but it is often a requirement of the application in which it will be used, with each application requiring its own specific parameters.
In glass production, moisture must be carefully balanced so that it is not too high or too low; if the level of moisture is too high, additional energy is required due to elevated melt temperatures and greater production times; if the moisture content is reduced too far, however, excessive dust is likely to occur in the furnace, which will impact product quality.1
Moisture content plays a critical role in the foundry sands used in metal casting applications, affecting parameters such as refractoriness, flowability, chemical inertness, and several other factors. Managing these properties is crucial to avoiding defects in the casting.3
While the hydraulic fracturing market in the US has died down, it is still going strong in other areas of the world. Here, industrial sand, called frac sand in this case, serves as a proppant, or a material that holds open rock fissures to allow hydrocarbons to flow out. Here, frac sand must not exceed a certain moisture threshold for use as a proppant.
Sand dryers must be designed to meet the precise moisture content of the intended application. In addition to this, industrial sand processing, like any industry, has a few specific requirements when it comes to drying equipment:
Not surprisingly, dryers destined for processing sand must be designed with sands abrasive characteristics in mind. Depending on how abrasive the specific source of sand is, this may necessitate the use of abrasion-resistant steel, higher shell thicknesses, and the reinforcement of high-wear areas.
Carryover occurs when sand particles become entrained in the air flow, causing them to leave the unit through the exhaust gas handling system. Not only does this result in lost product, but it also reduces dryer efficiency. Sand dryers must be designed to find a balance between maximum throughput and minimal carryover.
In many cases, the desired quality of the end product will require the use of a combustion chamber in order to preserve product integrity. A combustion chamber prevents the burner flame from coming into contact with the sand, preventing undesirable reactions that could otherwise result in a degraded product.
Whether drying sand for use as an abrasive,in the glass manufacturing process, or otherwise, sand producers are often confronted with the decision of choosing between the rotary dryer and the fluid bed dryer.
While fluid bed dryers are still commonly used, rotary drum dryers have become the industrys preferred choice in most cases. This is because their robust construction is well suited to handling the demanding processing conditions characteristic of the industry.
Additionally, rotary drum dryers not only accommodate a higher throughput than fluid bed dryers, but they also use comparatively less electrical energy, requiring a lower volume of air, and unlike fluid beds, offering further energy savings when running at a reduced capacity.
Industrial sands bring modern society many of the products and materials we rely on throughout our daily lives. Sand dryers, and rotary drum dryers in particular, play a key role in helping to produce sand suited to the unique specifications of its intended application, but must be designed with sands characteristics in mind.
FEECO is a preferred provider of custom rotary drum dryers. All FEECO sand dryers are designed around the specific characteristics and goals of the intended product for an optimized drying solution that not only performs reliably, but stands the test of time. For more information on our sand dryers, contact us today!
Rotary cascade dryers have the feed materials pass through a rotating cylinder together with a stream of hot gas. Internal lifters or flights elevate the feed and drop it in a curtain from the top to the bottom cascading along the length of the dryer. Flights need to be carefully designed to prevent asymmetry of the curtain. Material moves from one end of the dryer to the other by the motion of the material falling due to the angle of inclination of the drum. Some rotary dryers are double and triple pass units where each drum is nested inside the previous drum.
Rotary louver dryers have the feed materials supported and moving over a set of louvers mounted to an external rotating drum. The hot gas is introduced into a tapered bustle below the feed ring. The air passes through the louvers and then the product before being exhausted from the dryer.
The rotation of the drum causes the material to roll and mix providing intimate contact with the drying gas. Material moves from one end of the dryer to the other by the motion of rolling, some fluidization and due to the angle of inclination of the drum.
The dryer is widely used for drying materials in the industries of cement, mine, contraction, chemical, food, compound fertilizer, etc. Feeding and discharging unit is installed with thermocouple to control drier temperature. The temperature change of driers feeding end can be indicated by the thermometer to control the inner drier temperature (generally 250-350o)
This dryer adopts direct flow type of heating with heat source from firing unit. The material to be dried is pushed back immediately by spiral board when enters the shell from feeding tank and feeding chute. Because the drier is installed in slope, material flows to the back end under gravity and rotation force, meanwhile, it is lifted by board repeatedly and thrown down accordingly, which make the material form even curtain, and exchange heat sufficiently with inner the heat flow. In the end, water in the material is dried by repeatedly scattering.
Mostly Direct. Flow is co-current or counter current for cascade dryers. Flow is a combination of through the bed, cross, co-current or counter current for rotary louvers. Residence time Controllable. Residence time can be altered by varying the speed of rotation of the drum and the drum angle. Fill can be varied. Fills are typically between 7% and 25% of the cross sectional area of the drum.
Drying is a complex thermal process and a crucial stage in the manufacture of many products in various industries. Reliable and accurate process monitoring techniques are needed to achieve a consistent product quality. A new and innovative method was developed that uses passive acoustics as a non-invasive, real-time monitoring technique for end-point detection in rotary dryers.
This study used molecular sieves as an example of solid particles for which tight control of product moisture is crucial. A higher than ideal moisture results in sieves with a poor adsorption performance while a lower moisture results in excessive attrition. Current end-point detection methods available for this critical manufacturing stage are inadequate and prevent the production of molecular sieves with the best possible adsorption capability.
A microphone recorded acoustic emissions during the drying of molecular sieves in a 1.5m diameter rotary dryer. Signal analysis revealed that the critical end-point, corresponding to maximum moisture removal without attrition, can be detected by standard deviation analysis of the acoustic emissions. This provides a useful monitoring technique that can prevent the significant losses associated with over-drying. Multi-linear regression analysis of the acoustic emissions using wavelets or power spectral density provides an effective method of achieving a specific moisture content. Passive acoustic monitoring for end-point determination can be easily implemented into current industrial drying processes to prevent over-drying, reduce production costs, and improve product quality and consistency.
A new and innovative method using non-invasive acoustic measurements was developed to monitor drying of molecular sieves in a rotary dryer. The standard deviation of the acoustic signals provided critical end-point detection while the moisture content of the sieves could be determined from Fourier or wavelet analysis of the acoustic measurements.Download : Download full-size image
A new formula for prediction of the mean residence time in rotary dryers is proposed.The slope and number of flights are taken into account in the new corrected formula.Moisture content of particle is taken into account in the new corrected formula.The prediction data agrees well with the experimental results.
The mean residence time of granular particles is one of the most crucial indexes in drying processes. In this paper, a new formula for correction of the mean residence time (MRT) is proposed, which includes the correlation among the MRT and the slope, number of flights and moisture content of particle. As a consequence, the results obtained by the new corrected formula agree well with the experimental. Then, a series of experiments is presented to describe the mean residence time and motion performance of flexible filamentous granular particles under different operating conditions. In order to meet the requirements of description properly on the residence time of granular particles, slope and rotational speed of drum, moisture content of particle at the inlet, mass flow rate of particles, and velocity of air flow are taken into account. Experimental results on flexible filamentous particles demonstrate that the mean residence time is significantly influenced by those parameters mentioned above. Moreover, the decrease of drum slope makes the mean residence time rise, and the increase of rotational speed results in the dropping of mean residence time. The reduction of mean residence time becomes slower with the faster increase of rotational speed. Moreover, the mean residence time climbs following the increase of moisture content and mass flow rate of particles at the inlet while experiences a slightly drop with the increase of air flow velocity.