Field of the Invention Invention relates to dosing apparatuses, especially to aerodynamic dosing apparatuses for mixing fine particles, especially fine carbon particles with gas for creating gas-particles mixture.

Background of the Invention

Various dosing apparatuses exist which are configured to mix and/or dose the particles with air or any other gas.

State of art also discloses dosing apparatuses or mixers for preparation fuel or combustible mixture to a specification of certain burner or any other combustion-providing device. Dosing apparatus is a part of fuel burning systems, wherein particles, especially coal particles are mixed with an air before to be supplied to the burner or boiler. The aim of the dosing apparatus is to prepare the mixture of particles and air, wherein the particles are in uniform distribution and in a certain percentage to the air. As particle size is reduced up to 1 micron or less, the ordinary dosing apparatuses cannot provide necessary distribution of said particles in the air as well as maximum sputtering, separation of charcoal particles from each other in the air is reduced.

Summary of the Invention

Object of the invention is to create a dosing apparatus, which is able to prepare a mixture of fine particles and air with necessary distribution and certain percentage of fine particles to air, as well as with maximum sputtering, separation of fine particles from each other in the air, oxygen or any other gaseous environment.

The aims of the invention is reached by design of an aerodynamic dosing apparatus for preparing a mixture of fine particles and air for creating air-particles mixture to be fed further for burning combustible fuel in case of combustibles mixtures or for dosing medicine in manufacturing of precise dosed pharmaceutical products. The aerodynamic dosing apparatus comprises three main elements: a hopper for feeding fine particles to be mixed with air, a tube attached to the hopper for feeding fine particles further for dosing and distribution to a third element, which is a dozer. The dozer is positioned at one end of the tube. Mixing and distribution of particles with air or any other gaseous environment is performed in said dozer.

The hopper may comprise additional means for transportation of the fine particles into the tube, for example screw conveyor. The hopper is preferably in the form of truncated cone, but it may be also in any other form, like cylinder, to facilitate feeding of fine particles into the tube.

The dozer comprises a dozer housing in the form of truncated cone with a narrow section in the lower part of the dozer housing and a wide section in the upper part of the dozer housing. Both sections of the truncated cone dozer hosing may comprise further cylindrical sections. The wide section of the dozer housing may be in the form of cylinder. The narrow section of the dozer housing may be in the form of cylinder.

The tube is inserted into the dozer through the wide section of the dozer housing and extends or protrudes into the dozer housing such that a circular gap is formed between an edge of the tube and an inner surface of the dozer housing. The circular gap may vary in a result of the movement of the tube relative to the inner surface of the dozer housing. The position of the circular gap in the dozer depends on an inclination angle of the conical dozer housing and diameter of the tube. The circular gap is adjustable by means of an actuator attached to the tube for providing movement of the tube into the dozer housing up or down relative to the inner surface of the dozer housing. The circular gap is enlarged by the movement of the tube out from the dozer housing or into the dozer housing and the circular gab is reduced by the movement of the tube into the dozer housing or out of the dozer housing.

Moreover, the gap divides the dozer in two chambers. The first chamber is formed in the area where the fine particles from the tube are introduced into the dozer and mixed with the air or any other gaseous environment coming from the gas inlet nozzle or nozzles. The second chamber is arranged upstream from the first chamber, wherein the mixture of air or any other gaseous environment and fine particles is fed from the first chamber through the circular gap and said mixture is ready to be fed out from the dozer through outlets. The aerodynamic dosing apparatus further comprises at least one gas inlet nozzle positioned in a narrow section of the dozer housing or in the first chamber of the dozer for feeding pressurized gas into the dozer housing. The gas inlet nozzle is positioned tangentially on a sidewall of the narrow section of the dozer housing. The gas inlet nozzle may be arranged at an angle relative to a central axis of the aerodynamic dosing apparatus.

The aerodynamic dosing apparatus further comprises at least one outlet positioned in a wide section of the dozer housing or in the second chamber of the dozer for outlet of a mixture of fine particles and gas out of the dozer.

The aerodynamic dosing apparatus further comprises one bellows arranged at the connection point between the hopper and the tube and another bellows arranged at the connection point between the tube and the dozer for providing hermetical and heat resistant healing. In result of which the dosing apparatus is able to receive gas or any other fluid in the range of about -190 to about 700 °C.

The aerodynamic dosing apparatus further comprises one circular insert arranged between the hopper and the tube at the connection point thereof and another circular insert arranged between the tube and the dozer at the connection point thereof for aligning of the hopper with the tube and the tube with the dozer. The circular inserts also provide additional sealing.

The tube and the dozer may be coaxially arranged on the central axis of the aerodynamic dosing apparatus. Moreover, the hopper, the tube and the dozer may be coaxially arranged on the central axis of the aerodynamic dosing apparatus.

The apparatus further comprises a detachable closure positioned at the narrow section of the dozer housing. The detachable closure may be in the form of threaded cap, which can be screwed or unscrewed depending on the necessity. The following closure provides easy cleaning and inspection of the hopper and the tube inserted into the hopper.

The designed dosing apparatus may be used not only for mixing and dosing of fine particles of coal but also any other type of fine particles like medicine particles. The dosing apparatus is able to receive almost any gaseous matter or gas including inert gases, steam and air. Gasses are fed under pressure to facilitate mixing of fine particles with said gas fed through gas inlet nozzle.

Brief Description of the Drawings

These and other objects and advantages of the invention and a better understanding of the principles and details of the invention will be evident from the following description taken in connection with the following drawings in which: Fig. 1 illustrates an aerodynamic dosing apparatus in isometric view.

Fig. 2 illustrates an aerodynamic dosing apparatus in a front view.

Fig. 3 illustrates a cross section taken along a plane A-A of Fig. 2 showing an aerodynamic dosing apparatus.

Fig. 4 illustrates a cross section taken along a plane F-F of Fig. 2 showing a narrow section 3B of a dozer housing 3A with air inlet nozzles 5.

Fig. 5 illustrates a cross section taken along a plane E-E of Fig. 2, which shows a wide section 3C of a dozer housing 3A with outlets 7.

Fig. 6 illustrates an enlarged view G of a section of Fig. 3 showing a circular gap 4 between an edge of a tube 2 and an inner surface of a dozer housing 3A.

Fig. 7 illustrates an enlarged view H of a section of Fig. 3 showing a bellows 9A and a circular insert 10A at a connection point of a hopper 1 and a tube 2.

Detailed Description An aerodynamic dosing apparatus for preparing a mixture of fine particles and gas for creating a gas-particles mixture comprises three main elements - a hopper 1, a tube 2 and a dozer 3 (Fig. 1 to 3). The hopper 1 is a chamber in the form of truncated cone and is configured for feeding fine particles to be mixed with a gas. The tube 2 attached to the hopper 1 for feeding fine particles downstream to a dozer 3. The dozer 3 is positioned at one end of the tube 2. The dozer 3 comprises a dozer housing 3A in the form of truncated cone with narrow section 3B in the lower part of the dozer 3 and wide section 3C in the upper part of the dozer 3. The wide section 3C of the dozer housing 3A is in the form of cylinder, but the narrow section 3C of the dozer housing 3A is in the form of cylinder. The dozer 3 comprises a detachable closure 6 positioned at the narrow section 3B of the dozer housing 3A. The detachable closure 6 is in the form of threaded cap.

The tube 2 is inserted into the dozer 3 through wide section 3C of the dozer housing 3A and extends into the dozer housing 3A such that a circular gap 4 is formed between an edge of the tube 2 and an inner surface of the dozer housing 3A (see Fig. 3 and 6). The hopper 1, the tube

2 and the dozer 3 are coaxially arranged on the central axis X of the aerodynamic dosing apparatus. An aerodynamic dosing apparatus further comprises eight gas inlet nozzles 5 positioned in a narrow section 3B of the dozer housing 3A and attached thereto for feeding pressurized gas into the dozer housing 3A. The gas inlet nozzles 5 are positioned tangentially on a sidewall of the narrow section 3B of the dozer housing 3A (see Fig. 4). An aerodynamic dosing apparatus further comprises none outlets 7 positioned therearound in a wide section 3C of the dozer housing 3A and attached thereto for outlet of a mixture of fine particles and gas out of the dozer

3 (see Fig. 5).

The dosing apparatus further equipped with an actuator 8 attached to the tube 2 and arranged of a guide 10 (see Figs. 1 to 3). The guides 10 also serve as reinforcement elements for said apparatus. The actuator 8 provides movement of the tube 2 into the dozer housing 3A up or down relative to the inner surface of the dozer housing 3A in such way that the circular gap 4 is adjustable (see Fig. 6).

The apparatus further comprises one heat resistant bellows 9A arranged at the connection point between the hopper 1 and the tube 2 and another heat resistant bellows 9B arranged at the connection point between the tube 2 and the dozer 3 (see Fig. 7).

The apparatus further comprises one circular insert 10A arranged between the hopper 1 and the tube 2 at the connection point thereof and another circular insert 10B arranged between the tube 2 and the dozer 3 at the connection point thereof for aligning and sealing (see Fig. 7).