BURNER HEAD FOR LOW CALORIFIC FUELS

Abstract

The burner, which comprising an air supply pipe, fuel supply pipe attached to a central burner tube, which is terminated by the front face on the side of the supply pipe whereas in the front face a support tube is fixed, on which a burner head at the burner's output is mounted, the burner head is provided with nozzles arranged in a circle near to the inner perimeter of the burner head and forming the primary stage of the burner, and further the burner head is provided with angled grooves on the outer perimeter, which form the secondary stage of the burner, and further the whirler with its inner perimeter is arranged onto central burner tube at its outlet end, and the whirler's surface has conical shape extending outwardly and the whirler's surface openings, arranged in a circle are provided.

Claims

1. The burner, which comprising an air supply pipe, fuel supply pipe attached to a central burner tube, which is terminated by the front face on the side of the supply pipe, characterized in, that in the front face (6) a support tube (7) is fixed, on which a burner head (4) at the burner's output is mounted, the burner head (4) is provided with nozzles (13) arranged in a circle near to the inner perimeter of the burner head (4) and forming the primary stage of the burner (1), and further the burner head (4) is provided with angled grooves (14) on the outer perimeter, which form the secondary stage of the burner (1), and further the whirler (2) with its inner perimeter (15) is arranged onto central burner tube (5) at its outlet end, and the whirler's surface (16) has conical shape extending outwardly and the whirler's surface (16) openings (9), arranged in a circle are provided.

2. The burner according to claim 1, characterized in, that the openings (9) on the whirler (2) are arranged in three concentric circular rows.

3. The burner according to claim 1, characterized in, that the fuel supply pipe (8) is provided on the wall with weld-on sleeve (11) for connection of the pressure gauge or other measuring device.

4. The burner according to claim 1 characterized in, that on the free end of the support tube (7) screws (12) for aretation of added atomiser are located

Description

BRIEF DESCRIPTION OF DRAWINGS

[0016] The invention will be further described using drawings, where

[0017] FIG. 1 is a longitudinal cross-section of built-in burner assembly according to the invention with arrangement of individual parts,

[0018] FIG. 2 represents side view of the burner according to the invention in the direction of media flow,

[0019] FIG. 3 represents a detail of the burner head in a perspective view and

[0020] FIG. 4 represents a detail of the whirler of combustion air according to the invention in a perspective view.

PREFERRED EMBODIMENTS OF THE INVENTION

[0021] In FIG. 1 a longitudinal section of built-in burner assembly can be seen, which consists of a fuel supply pipe 8 provided with connecting flange 10, through which the fuel F enters in the direction of the arrow. Further is the fuel supply pipe 8 attached to a central burner tube 5 which has a front face 6 on the side of the supply pipe 8, which has an opening in the middle to allow insertion of a support tube 7. The whole burner is not displayed, only its built-in assembly. Around it there are situated other standard parts of the burner, which are known to skilled persons. To the central burner tube 5, at its output end is, via weld-on reduction 3, with its inner perimeter 15 a whirler 2 attached. The central burner tube 5 and the weld-on reduction 3, which terminates the central burner tube 5, form together with the support tube 7 an assembly, which defines the flow of combustion fuel F. Thus, the fuel F flows in the direction of the arrow into space, which has a shape of a hollow cylinder, formed by the central burner tube 5 and the support tube 7. This cylindrical space has such a specific length, so that the previous turbulent flow is maximally stabilised. The stabilisation contributes to the uniform distribution of the fuel inside the cylindrical space and the fuel is then uniformly burnt out. The support tube 7 can be used for addition of an atomiser (not shown) for liquid fuel. At the free end of the support tube 7, screws 12 for arctation of such atomiser are situated. At the opposite inner end of the support tube 7 a groove on the burner output is milled into which a burner head 4 is inserted and welded-on, through which the fuel is distributed into combustion space.

[0022] On the wall of the fuel supply pipe 8 a weld-on sleeve 11 is located for connection of pressure gauge or other measuring device, which can be seen in FIG. 2. On the connecting flange 10 a shutter is possible to insert in order to regulate pressure on the desired level.

[0023] In FIG. 3 the burner head 4 in perspective view is shown. The fuel F flowing through the burner head 4 via nozzles 13, which are spaced in a circle at the inner perimeter forming the primary stage of the burner 1, is distributed uniformly along the central axis of the burner 1. This flow is important especially for the flame core stabilisation. In a stable situation in the flame core the flame envelope can be provided in a high rotational mode without disruption of the flame or unstable combustion. Burner head 4 is at its outer perimeter further provided with angled grooves 14, which change the momentum direction of flowing fuel and form the secondary stage of the burner 1. The fuel gets after passing through the angled grooves 14 into tangential rotation along the central axis of the burner 1. Rotational flow causes better mixing of the fuel with the combustion air A, which arrives to the end of central burner tube 5 and simultaneously the flame is partially attached to the burner head 4.

[0024] In FIG. 4 whirler 2 in perspective view is shown, its wall 16 has conical geometry extending outwardly from the burner, which has a positive effect on the flow. In the illustrated embodiment, there are openings 9 spaced in three concentric circular rows on the wall 16 of the whirler 2, through which the combustion air flows. It is evident, that the circle with openings may be only one or there can be another number of concentric circles. After passage through the individual openings 9 there is a change in the air flow, namely the strong turbulent flow is created, due to which is the fuel brought into a tangential rotation and mixed with the combustion air even better. The angle of inclination of the wall 16 of the whirler 2 has an important role, since due to this inclination it is possible to direct partially the airflow, to direct it towards the centre of the flame, and causing a complete combustion.

[0025] The burner head 4 has defined number of nozzles 13 arranged in a circle, whereas the number and size of nozzles 13 is determined based on the requirements for maximum performance, according to which the dimensions are determined so, that the requested amount of fuel flows through the primary stage created in this way. The number, width, and depth of angled grooves 14 are determined as to allow the remaining fuel to flow through these grooves at maximum power and the groove 14 inclination angle is determined relative to the plane of the burner head 4 in such a way, to ensure optimal turbulent flow in a tangential direction.

INDUSTRIAL APPLICABILITY

[0026] The burner is intended for combustion of different types of low calorific fuels, also from other alternative devices, such as fuelifiers. Built-in burner assembly is applicable in plants, where waste fuels occurs, whose energy is let unused in burners with flaring and flue gases are emitted without use into the atmosphere. Another area where it is possible to use the burner, are biogas plants and heat sources connected thereto.