RU132875U1 - DRUM FURNACE FOR DRYING SAND - Google Patents

Abstract

A drum for drying sand containing a filling neck connected to an inclined rotary drum mounted on a fixed bed, a burner for burning gaseous fuel, an output neck and an exhaust for exhaust gases, characterized in that the rotating drum lies freely on the support rollers mounted on a fixed bed; additionally, thrust rollers are located on the rotating drum, resting on a fixed thrust ring mounted on a fixed bed.

Description

The technical field to which the utility model relates.

The utility model relates to drying equipment, namely, devices for drying bulk material (for example, sand) in a rotating drum and can be used in the construction, mining, transportation and other industries.

State of the art

Known dryer for bulk materials (AS USSR No. 1252630, publ. 08/23/1986) containing a rotating drum with nozzles for supplying and discharging coolant, a distribution box made along the entire length of the drum and fixedly connected with pipes for supplying and discharging coolant.

A disadvantage of the known device is the difficult drainage of water from the bulk material due to the formation of a dense layer on the surface.

A device for drying bulk materials with flue gases (RF patent for the invention No. 20145466, publ. 06/30/1994) containing a pneumatic tube dryer, a condensation zone of a heat pipe, a furnace, an evaporation zone of a heat pipe, a mechanism for loading bulk material, a cyclone.

A disadvantage of the known device is the low economic efficiency of the method and the pollution of the material by flue gases.

A known installation for drying materials (AS USSR No. 685321, publ. 09/15/1979), containing a drum driven in rotational motion, a loading chamber with devices for supplying the starting components and a device for introducing a heat agent in the center of the drum, an unloading chamber with devices for outputting dry material and a device for removing the spent heat agent from the middle part of the drum, made in the form of an annular collector, covering the drum and communicated with it through windows evenly spaced around the circumference ty drum and equipped with visors to prevent loss of material, the blades for mixing and transportation of the processed material.

The disadvantage of this installation is the complexity of the design of the installation and, as a consequence, the complexity of operation, maintenance and repair.

The closest in technical essence and the achieved positive effect - the prototype - is a device for drying bulk wet materials (certificate for utility model No. 31638, publ. 08/20/2003), including a loading chamber for raw material, a furnace for burning gases, a rotary rotary kiln, a chamber for unloading dry material, a device for removing gases, and the chamber for unloading dry material is made in the form of windows evenly spaced around the circumference of the drum in the form of belts and equipped with screens for sieving high sutured material into different fractions.

A disadvantage of the device for drying bulk wet materials is the occurrence of undesirable torques, causing an increased level of friction and vibration of the rotary rotary kiln. Also a disadvantage of the known design is the complexity of the design of the device, the relatively low productivity and durability due to the presence of a large number of parts and assemblies.

Utility Model Disclosure

The claimed utility model is based on the task of creating a reliable and durable, compact and economical during operation of the device, providing high quality sand drying.

The technical result of the claimed utility model is to simplify the design, reduce friction and vibration, and as a result, increase durability and increase the productivity of the drum furnace.

The specified technical result is achieved in that the drum furnace for drying sand contains a filling neck connected to an inclined rotating drum mounted on a fixed frame, a burner for burning gaseous fuel, an outlet neck and an exhaust for exhausting gases, and according to a utility model, the rotating drum is free on support rollers mounted on a fixed bed; additionally, thrust rollers are located on the rotating drum, resting on a fixed thrust ring mounted on a fixed bed.

Brief Description of the Drawings

Figure 1 presents a diagram of a drum furnace - a side view, figure 2 is a diagram of a line of two drum furnaces - top view.

Utility Model Implementation

The drum furnace contains: a fixed bed 1, a fixed thrust ring 2, thrust rollers 3, a rotating drum 4, supporting rollers 5, an electric motor 6, a burner 7, a filling neck 8, an exhaust hood 9, an outlet neck 10. The rotating drum 4 is freely lying, so called "floating", on the support rollers 5. The thrust rollers 3 are located on the rotating drum 4, and the thrust ring 2 is mounted on a fixed frame 1. The drum 4 is driven by an electric motor 6. The drum furnace is installed at an angle to the horizon, and the deadbolt Naya neck 8 is higher than the outlet mouth 10.

A drum oven for drying sand works as follows.

Gaseous fuel is supplied to the burner 7 and ignited. The combustion products of gaseous fuels - heated exhaust gases - flow through the filler neck 8 into the drum 4. The drum 4 begins to rotate using an electric motor 6. The drum 4 rotates around its axis, lying on the support rollers 5, resting on the support rollers 3 in a stationary thrust ring 2 Thrust rollers 3 move along the surface of the thrust ring 2, moving around the axis of the drum 4.

Sand is fed into the rotating drum 4 through the filling neck 8 manually by one operator. Under the influence of gravity and additional acceleration imparted by the exhaust gases, the sand moves in the drum 4 from the filling neck 8 to the outlet neck 10. During this movement, the sand in the rotating drum 4 contacts the heated exhaust gases and mixes with them, due to which sand drainage. By changing the rotation speed of the drum 4, it is possible to control the residence time of the processed material in the drum furnace. The moisture removed from the sand in the form of water vapor together with the exhaust gases is removed from the drum 4 by means of a hood 9.

Dry sand spills out through the mouth 10. Ready dried sand is sent for further use.

Thus, the "floating" rotation of the drum is provided not only by the rotation of the support rollers, but also by the movement of the thrust rollers on the surface of the thrust ring. This design of the drum furnace increases the smoothness of rotation of the drum, reduces its runout, vibration and wear, and not only increases the durability of the device, but also minimizes the undesirable consequences of temperature deformations.

With such productivity and compactness of the claimed device, a line of such drum furnaces can be created, which can be serviced by one operator.

An example implementation of the device.

1. For drying quartz sand, two drum furnaces of the proposed design were made of steel 3 m long and 0.6 m in diameter. A burner with a heat output of 70-100 kW ensured a temperature in the drum working zone in the range of 550-620 ° ^C.

The productivity of one furnace allowed to carry out the drying process of 2 tons of quartz sand with an initial moisture content of 4-6% to a final moisture content of 0.1-0.2% in one hour.

The maintenance of two furnaces was carried out by one operator, and, judging by the intensity of work, the operator had the opportunity to service two more drum furnaces.

A comparative analysis of the claimed utility model showed that the set of essential features of the claimed device is not known from the prior art and therefore corresponds to the patentability condition “Novelty”.

The above information confirms the possibility of using the claimed device for drying bulk material, which can be used in the construction, mining, transport and other industries, and therefore meets the patentability condition "Industrial applicability".

Claims (1)

A drum for drying sand containing a filling neck connected to an inclined rotary drum mounted on a fixed bed, a burner for burning gaseous fuel, an output neck and an exhaust for exhaust gases, characterized in that the rotating drum lies freely on the support rollers mounted on a fixed bed; additionally, thrust rollers are located on the rotating drum, resting on a fixed thrust ring mounted on a fixed bed.

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