RECUPERATOR BURNER WITH A RECUPERATOR FOR GUIDING COUNTER-FLOWING FLUIDS

Abstract

Recuperator burner including a recuperator, which has two separate flow systems provided for guiding counter-flowing fluids, each system including at least one flow channel being open on both sides, and the at least two fluids entering/leaving via intake inputs and offtake outputs at opposite ends of the burner inlet and burner outlet, and one of the fluids is set up by a combustion air to be preheated and the other by an exhaust gas of the burner, wherein the recuperator accommodates the two flow systems in a heat transfer body which is made of one piece and whose jacket-shaped outer wall section at the burner inlet defines a flow pot including said input and output integrally attached.

Claims

1. Recuperator burner comprising a recuperator, which has two separate flow systems provided for guiding counter-flowing fluids, each system comprising at least one flow channel being open on both sides, and the at least two fluids entering/leaving via intake inputs and offtake outputs at opposite ends of the burner inlet and burner outlet, and one of the fluids is set up by a combustion air to be preheated and the other by an exhaust gas of the burner, wherein the recuperator accommodates said two flow systems in a heat transfer body which is made of one piece and whose jacket-shaped outer wall section integrally attached.

2. Recuperator burner according to claim 1, characterized in that the flow pot is defined by an outer wall section having a wall tapering, which forms a bulbous extension of the heat transfer body having shoulder sections for the integrally connection of necks for combustion air to be preheated and the output for exhaust gas from the burner.

3. Recuperator burner according to claim 1, characterized in that an interior space of the flow pot surrounds at least one guide wall for the fluidically separate guidance of the counter-flowing fluids to the input and output.

4. Recuperator burner according to claim 3, characterized in that the at least one guide wall is shaped as a lateral surface of a body of revolution.

5. Recuperator burner according to claim 3, characterized in that the at least one guide wall inserts a space separating system into the flow pot for a transition of the at least one flow channel into the input or the output.

6. Recuperator burner according to claim 3, characterized in that the at least one guide wall is formed integrally with the heat transfer body.

7. Recuperator burner according to claim 1, characterized in that the at least one flow channel of each of the two flow systems is divided into a plurality of partial flow channels for guiding counter-flowing fluids.

8. Recuperator burner according to claim 7, characterized in that the partial flow channels of one and/or the other flow channel can be fluidically connected by channel wall openings.

9. Recuperator burner according to claim 1, characterized in that the at least one flow channel in each case has a number of lined-up tube sections as at least one flow-through channel, and the tube sections being formed from minimal surface elements and the tube sections being connected in a continuous manner.

10. Recuperator burner according to claim 1, characterized in that the minimum surface elements are set up by triple periodic minimum surfaces.

11. Recuperator burner according to claim 10, characterized in that the cell structures resulting from the triple periodic minimum surface are cubic, cylindrical or spherical.

12. Recuperator burner according to claim 1, characterized in that at least one third and/or fourth flow system, each with at least one flow channel open on both sides for at least one third and/or fourth fluid, is integrated into the heat transfer body.

13. Recuperator burner according to claim 12, characterized in that an inlet and/or outlet connection piece for the at least third and/or fourth flow system is integrally attached to the flow pot.

14. Recuperator burner according to claim 1, characterized in that the heat transfer body has a flow-through inner body section which can be positioned extending into the flow pot, as a result of which the latter can be directly flowed against laterally with combustion air to be preheated.

15. Recuperator burner according to claim 14, characterized in that an acute or obtuse angle of flow can be formed in the region of the input.

16. Recuperator burner according to claim 1, characterized in that the input and the output are positioned opposite each other on the recuperator in an aligned manner.

17. Recuperator burner according to claim 1, characterized in that a combustion tube is introduced at the burner inlet, which opens into the combustion chamber and which extends through the heat transfer body.

18. Recuperator burner according to claim 1, characterized in that the heat transfer body is formed from a ceramic and/or metallic material.

19. Recuperator burner according to claim 1, characterized in that the recuperator is designed as a ceramic recuperator which is monolithic.

20. Recuperator burner according to claim 18, characterized in that the ceramic is made of a non-oxide and/or oxide ceramic material, in particular silicon-infiltrated, reaction-bonded silicon carbide (RBSiC), silicon-infiltrated, reaction-bonded silicon carbide/boron carbide (RBSiC/B4C), silicon-infiltrated silicon carbide (RBSiC), silicon nitride-bonded silicon carbide (NSiC), pressureless sintered silicon carbide (SSiC), recrystallized silicon carbide (RSiC), aluminium oxide, silicate-bonded silicon carbide, zirconium oxide.

Description

[0024] The invention is explained in more detail below with reference to the embodiments shown in the attached figures.

[0025] FIG. 1 shows a perspective view of a recuperator burner, partially cut, comprising a ceramic recuperator according to a first embodiment,

[0026] FIG. 2 shows a longitudinal section of the recuperator burner as shown in FIG. 1,

[0027] FIG. 3 shows a cross-section of the recuperator burner according to FIG. 1,

[0028] FIG. 4 shows a further longitudinal section of the recuperator burner according to FIG. 1,

[0029] FIG. 5 shows a perspective, partially sectioned view of a recuperator without a jacket tube according to a second embodiment of a recuperator burner,

[0030] FIG. 6 shows a longitudinal section of a recuperator as shown in FIG. 5,

[0031] FIG. 7 shows a perspective, partially sectioned view of a recuperator without a jacket tube according to a third embodiment of a recuperator burner,

[0032] FIG. 8 shows a cross-section of a recuperator according to a fourth embodiment of a recuperator burner,

[0033] FIG. 9 shows a perspective, partially sectioned view of a recuperator without a jacket tube according to a fifth embodiment of a recuperator burner.

[0034] The invention relates to a recuperator burner which can be divided into three areas independently of the relevant functional areas, namely a connection area with burner inlet, a recuperator area and a flame outlet with burner outlet, as described in detail below.

[0035] FIG. 1 to FIG. 4 show a first embodiment of a recuperator burner, comprising a recuperator 1, which can be made of a metallic and/or ceramic material, for example. The recuperator 1 has two separate flow systems 2, 3, each with at least one flow channel 4, 5 being open on both sides, for guiding counter-flowing fluids. The at least two fluids can enter/exit via intake inputs 6, 7 and offtake outputs 8, 9 at the opposite ends of the burner inlet 10 and the burner outlet 11.

[0036] Concerning the counter-flowing fluids, one is formed by combustion air to be preheated and the other by an exhaust gas from the burner. In the embodiment shown in FIG. 1 to FIG. 4, the combustion air to be preheated flows through the flow channel 5 and the exhaust gas flows through the outwardly open flow channel 4, which is sealed by an adjacent recuperator jacket 20. A heat transfer body 12 is provided as the recuperator 1, which accommodates the two flow systems 2, 3 in a heat transfer body 12 made of one piece, the jacket-shaped outer wall section 14 of which provides a flow pot 13 at the burner inlet 10 comprising the input 6 and output 8 integrally attached.

[0037] As shown in FIG. 2 in particular, the input 6 for combustion air or fresh air to be heated can be positioned at least partially axially overlapping the heat transfer body 12 in order to allow combustion air to be preheated to flow directly to it from the side.

[0038] The flow pot 13 can be made by an outer wall section 14 with a wall taper relative to the heat transfer body 12, which shapes a bulbous extension 15 of the heat transfer body 12. The bulbous extension 15 can also be provided with shoulder sections 16 for the one-piece connection of necks 17, 18 for the input 6 for combustion air to be preheated and the output 8 for exhaust gas from the burner.

[0039] The flow pot 13 provides an interior space that surrounds at least one guide wall 19 for the fluidically separate guidance of the counter-flowing fluids to the input 6 and output 8.

[0040] The at least one guide wall 19 can be shaped as a lateral surface of a rotational body, as shown in the embodiment according to FIG. 5.

[0041] The at least one guide wall 19 can insert a space separating system 21 into the flow pot 13 for a transition of the at least one flow channel into the input 6 or the output 8, as shown in FIG. 7.

[0042] The at least one guide wall 19 is preferably made in one piece with the heat transfer body 12.

[0043] As FIG. 1 to FIG. 4 further show, the at least one flow channel 4, 5 of each of the two flow systems 2, 3 is divided into a plurality of partial flow channels for guiding counter-flowing fluids.

[0044] The partial flow channels of one and/or the other flow channel 4, 5 can be fluidically connected through channel wall openings 22.

[0045] The at least one flow channel 4, 5, respectively has a number of lined-up tube sections as at least one flow channel 4, 5, wherein the tube sections are made from minimal surface elements and the tube sections are connected in a continuous manner.

[0046] The minimal surface elements are preferably formed by triple periodic minimal surfaces. The cell structures resulting from the triple periodic minimal surface can be cubic, cylindrical or spherical.

[0047] The first embodiment shown in FIG. 1 to FIG. 4 has a cubic cell structure. FIG. 8 shows an embodiment with a cylindrically shaped cell structure.

[0048] The recuperator burner 1 further comprises, for example, a combustion gas connecting piece 23 for a combustion tube passing through the heat transfer body 12, via which combustion gas can be fed to the burner outlet 11. Instead of a combustion tube, a combustion gas passage can also be integrally molded into the heat transfer body 12 from the combustion gas connecting piece 23.

[0049] As FIG. 9 shows, at least one third and/or fourth flow system, each with at least one flow channel open on both sides for at least one third and/or fourth fluid, can be integrated into the heat transfer body.

[0050] For the at least third and/or fourth flow system, an inlet and/or outlet connecting piece 24 can be integrally formed on the flow pot.

[0051] FIG. 1 to FIG. 4 also show that the heat transfer body 12 can have an inner body section 25 through which air can flow, which can be positioned so that it extends into the flow pot 13, as a result of which the combustion air to be preheated can flow directly onto it from the side. An acute or obtuse flow angle can be formed in the area of the input 6 as well as the output 8.

[0052] As the embodiment according to FIG. 1 to FIG. 4 shows, the input 6 and the output 8 can, for example, be positioned opposite each other on the recuperator 1. The second embodiment according to FIG. 5 and FIG. 6 shows connecting pieces for the input 6 and output 8 arranged at an angle to each other.

[0053] FIG. 7 shows a third embodiment with opposing connecting pieces for the input 6 and output 8 and a space separation system 21 in the flow pot 13, as described above.

[0054] An all-ceramic version of the recuperator 1 is preferably monolithic. The ceramic is preferably made of silicon infiltrated silicon carbide. Non-oxide and/or oxide ceramic materials are particularly preferred, especially silicon-infiltrated, reaction-bonded silicon carbide (RBSiC), silicon-infiltrated, reaction-bonded silicon carbide/boron carbide (RBSiC/B4C), silicon-infiltrated silicon carbide (RBSiC), silicon nitride-bonded silicon carbide (NSiC), pressureless sintered silicon carbide (SSiC), recrystallized silicon carbide (RSiC), aluminium oxide, silicate-bonded silicon carbide, zirconium oxide.