HU193686B - Recuperative gas-burner of increased impulse - Google Patents

Abstract

The present invention relates to a combustion plant for the production of flue gas with a simple exit pulse, which allows direct utilization of the heat content of the flue gas by means of a recuperator integrated with it. The gas burner (3) forming the cold burner chamber (3) of the present invention, the cold air preheating ring channel (6), in direct contact with the flue gas ring space (12), provided with the ring channel, providing a flow of preheated air and a reversal of 180 °. the flange side channel of the flue gas, the ring channel (6) and the flange (9) of the flue gas ring channel (7) into the assembly unit at an angle of tangent to the distributor disc, preferably with an angle of 40-60 ° from the flue gas ring channel (7); the passage holes (5) for supplying heated air to the combustion chamber (3) and through the distribution plate (9) to the circulating channel (6) from the distribution space to the cold air. z Air Figure 1

Description

BACKGROUND OF THE INVENTION [0001] The invention relates to a simple construction of a combustion plant for the production of flue gas having an increased exit impulse, which allows the direct utilization of the heat content of the flue gas by means of an integrated recuperator.

Many variants of pulse and recuperative burners are known in the literature and practice.

Hungarian Patent No. 169655 relates to pulsed noise with reduced noise. The air enters the combustion chamber with significant torque through the central gas jet. Due to the intense mixing, the combustion of the fuel takes place inside the masonry chamber and the flue gas with an exit rate of 100-180 m / sec flows into the furnace space.

The burner has no internal recuperation unit. Although it is possible to incorporate it by altering essential structural elements, the increased combustion chamber temperature would cause the chamber to fail rapidly.

U.S. Patent No. 4,255,122 discloses a recuperative system burner that utilizes a portion of the heat content of the flue gas by the uptake of air flowing axially in an annular space. The preheated air, flowing through an inner ring concentric with the former, serves directly to cool the combustion chamber throughout. The other part of the combustion air heats up as it flows through the pipe entering the combustion chamber.

In the construction, the air entering the combustion chamber has no momentum and the combustion does not end. The burner has no significant pulse. Reducing the outlet volume of the firebox due to the lack of cooling of the hot air mantle raises lifetime issues.

A solution of the same kind is described in English Patent No. 1,258,950. Here, the combustion air flows entirely within the annular mantle surrounding the cylindrical combustion chamber. Again, the exhaust flue gas does not have an increased pulse for more intense heat transfer.

English Patent No. 1,260,489 relates to a recuperative pulse burner. The air flows axially in an annular space and is also surrounded by flue gas from the outside in an annular space. The flow is countercurrent. The heated air is mixed with the gas entering the central nozzle into the masonry firebox connected to the recuperator unit as a continuation thereof, and the combustion takes place there. The combustion chamber design provides a significant exit impulse. A disadvantage of this solution is that the combustion chamber is structurally designed as a continuation of the recuperator, thus significantly increasing the size of the pulse and recuperative burners 2 described above. The inside of the recuperator rings is a functionally unused space.

British Patent Nos. 1243626, 1332125 and 1442128, and German Offenlegungschrift 2948048, describe burner structures with a conventional recuperator. Recuperators connected to standard burners are designed to increase the efficiency of the burners. Depending on the location of the recuperators, sufficient space is available, partially or fully outside the furnace wall. This greatly increases the size of the burners. Since the burners do not have a closed combustion chamber (the combustion takes place in the furnace chamber) they cannot be used as pulse burners.

A common disadvantage of the described solutions is that conventional burners without a closed combustion chamber formed inside the burner cannot be directly incorporated into pulse burners due to the limited heat demand of the structural materials. In the case of pulse burners, the introduction of hot air will cause the furnace to overheat, which means that known pulse burners do not meet the current stringent environmental regulations (NCK quantity).

It is an object of the present invention to provide a recuperative pulse burner which, by training the recuperator, provides a combustion chamber that is environmentally compatible by reducing the temperature of the furnace, but does not decrease the heat transfer rate provided by the burner due to the increased pulse.

BACKGROUND OF THE INVENTION The present invention relates to a pulsed recuperative gas burner having a cylindrical combustion chamber having a cool air preheating ring passageway arranged in a circumferential relationship with the flue gas vent annular space extending around the annular passage, providing a flow of preheated air and a 180 ° change of direction. a manifold which engages the annulus and the flue-side annular conduit in a structural unit, having an axis angled with the tangents to the distributor disc, preferably having an angle of 40 to 60 °; through the through holes for the ring passage.

The invention will be described with reference to the drawings, in which:

Figure 1 is a sectional view of a reciprocating gas burner with increased pulse, a

Figure 2 is a sectional view of a recuperator and air inlet.

Natural gas enters the combustion chamber 3 through the bores 2 from the compensating space 1. The air flows from the distribution space 4 through the air through hole 5 into the longitudinal annular conduit 6 which surrounds the combustion chamber 3 and is then formed. The primary preheated air is flowing 180 ° at the end of the combustion chamber 3 into the flue gas annular duct 7, and the air is introduced through the through holes 8 into the combustion chamber 3. The through holes 8 are arranged obliquely in the distributor disk 9, and their axes close at an angle, preferably 40 to 60 °, with the tangents to the distributor disk. The distributing disc 9 structurally unites the three combustion chamber side and gyürücsatornát 6 ^- 7 the flue gas side annular channels closed system (recuperator) for forming the air pre-heating.

In order to enhance the heat transfer, the pipe 10 surrounding the flue gas annular channel 7 is preferably provided with a plurality of longitudinal ribs 11 extending into the annular space 12 of the flue gas outlet. The ribs 11 can also be arranged in a spiral shape. In order to intensify the heat absorption of the air, helical baffles 13 may be incorporated in the flue gas ring 7.

The cooled flue gas is discharged through the channel 15 provided with the injector 14. A ceramic reduction element 16 is provided in the burner orifice.

Flowing through the annular passage 6, the enthalpy level of the air is increased while cooling the steel sheath defining the combustion chamber. The preheated air in the ring passage 6 is reversed in the opposite direction in the flue gas ring passage 7 at the nose portion of the burner. Here, it is indirectly contacted with the flue gas discharged in the flue gas outlet 12. This is the second stage of preheating, where the exhaust gas is cooled down. The heat transfer intensity can be increased by using the ribs on the jacket. The baffles 13 in the flue gas side ring space 7 also serve to increase the heat transfer coefficient *.

The preheated air thus enters the combustion chamber 3 through the distributor plate 9. The air inlet direction ensures proper mixing and thus combustion in a relatively small combustion chamber.

In order to intensify the heat work of the burner, the pulse of the exhaust flue gas is increased by a ceramic reduction element 16. Due to the favorable flow effect of the flue gas pulse thus increased, a significant surface heat transfer intensity is obtained.

Advantages of using the invention.

Due to the advantageously designed internal heat transfer system, the specific surface heat flux density is very high, which results in a reduction of the burner weight.

The dual air passage created by the application of the baffle roller allows cooling of the firebox, eliminating the need for a ceramic liner (weight and size reduction)

The perverted air stream introduced through the nozzles at an angle to the tangent, preferably below 40 ° to 60 °, allows a device to complete the combustion in the firing chamber without the need for a turbulence-less damper.

The exhaust flue gas velocity can be varied from 20 to 80 m / sec, so it is advantageous for smaller installations where pulse firing can have a detrimental effect. In the case of Na20 fired furnaces, the exit rate can be further increased by replacing the reduction element.

Claims (3)

An increased impulse recuperative gas burner with gas, air inlet and exhaust venting means, a combustion chamber, a recuperator, characterized in that it comprises a cylindrical combustion chamber (3), a cool air preheating annular passageway (6), an annular passageway (6) a manifold (9) for integrating the flue gas flange (6) and the flue gas flange (7) into a structural unit for direct flow and 180 ° reversal of the flue gas flange (12), directly connected to the flue gas outlet ring (12) in the manifold (9), through the exhaust manifold (8) and the manifold (4), angled with the pins 40 to the manifold (9), preferably having an axis 40 to 60 °, from the flue gas ring conduit (7) to the heated combustion chamber (3) ) the cold air is fed into the annular passage (6) via the distributor 45 (9) ato has through holes (5). Gas burner according to Claim 1, characterized in that it has ribs (11), preferably longitudinally arranged in a plurality of longitudinal directions, which are preferably secured to the flue gas ring channel (7) by welding. Gas burner according to Claim L or 2, characterized in that it has helical baffles (13) integrated in the flue gas ring channel (7).