Recuperative burner provided with a ceramic component.

p0001The invention relates to a short-length running, a uniform ausgestaltetes housing comprising, containing a replaceable recuperator heater with variable capacity, the combustion product emerges at high speed from the heater.

p0002The modernization of industrial furnaces in particular two important tasks to be solved, namely the increase of the internal heat exchange and the reduction of significant heat loss, the exhaust loss, ie the realization of the optimum primary heat utilization.

p0003The pulse heaters are important means for increasing the heat exchange within the working space. In these burners is determined by the high exit velocity of the combustion product (100 to 200 m / s) speeds up the heating of the insert by the increased convective heat transfer.

p0004For primary heat utilization recuperators of various types are used; the previous practice under a common recuperator was used per kiln; recently each burner is associated with a recuperator, so the heat of the exiting exhaust gas can be directly utilized.

p0005From technical literature and from practice different impulse burners are known. From this burner to those who spread the sound level even at a high exit speed of the combustion product (200 m / s) does not exceed the noise level of traditional burners. This demand can only be satisfied with pulse heaters such construction in which in the burner block (combustion chamber), the conditions of continuous mixing and combustion are ensured.

p0006The thermal efficiency of the exiting exhaust gases per burner is realized with the recuperative (provided with recuperators) burners. Because of the important characteristics of the previously known recuperative burners can be divided into the following groups:

p0007The first group are those burners in which the combustion chamber is cooled with the preheated combustion air, in other words, where the air preheating takes place not only by the utilization of heat of the exiting from the working space of the furnace exhaust gases, but by the cooling of the from the burners exiting combustion products. In this case, the predictable result of the air preheating Energiesparnis only seems to exist because the reduced due to the cooling of the combustion chamber temperature of the exiting combustion product corresponds to the measurable value far below border air temperature. Due to the cooling of the combustion chamber to be accelerated by preheating the air and higher temperature of the combustion product desired heat transfer is impaired in the furnace.

p0008This group is part of the burner described in GB-A-1258950. The combustion air flowing into the combustion chamber enclosing shell, wherein the cooling effect is significantly to validity. In addition, the velocity of the exiting combustion product and thus the pulse to increase the heat transfer within the working space are not sufficient.

p0009can be assigned to the US-A-4255122 and the torch for this category. The with an annulus profile configured, the combustion chamber enclosing skying cooled directly to the combustion chamber; Simultaneously, the combustion product is cooled with the air that flows through a projecting into the combustion chamber pipe.

p0010In our research and development company in the burner a recuperative gas burner of the type RQ was developed with increased pulse; also in this the force exerted by the preheated air to the combustion chamber cooling effect comes into play. The difference compared with the known solutions is that the Luftzuführbohrungen - which include with the tangents to the distribution plate at an angle of 40 to 60 ° - influence in the combustion chamber burning and the completion of the combustion process so that an increased pulse rate (20- 80 m / s) can be achieved.

p0011The second group includes those writers that although the combustion chamber is not cooled, but which is connected as an extension of the burner block of the burner to the recuperator, which results in a significant increase in dimension.

p0012Such a burner is described in GB-A-1 260 489. in which an annular profile having space and flowing in countercurrent to the exhaust air mixes with the gas in the burner block, where the combustion process takes place.

p0013The known solutions have many drawbacks. Thus, eg in any of the solutions, the effective utilization of heat (due to the cooling of the combustion chamber), as well as to increase the heat exchanges indispensable in the furnace combustion product speed pulses, at the same time available (which is the unsatisfactory degree of burn in the combustion chamber, air flow twisting, lack of proper mixing can be attributed to the open burner blocks of traditional burners); A further disadvantage is the small structural dimensions which are characteristic of the contemporary burner (due to the connected to the conventional burner recuperator and the pulse recuperative burners due to the built-in as a starting burner tile). Furthermore, in the known recuperative burners pulse missing the solution in an uncooled combustion chamber and at a strong air preheating (at 550 to 600 ° C) the elimination of NO_x prevented.

p0014Another disadvantage of known solutions is, that for each individual power value, a separate burner part with a corresponding structural design, on the one hand to simplify the mass production is impossible, on the other hand, no possibility for flexible adjustment to the temperature of the working space of the furnace is.

p0015By the invention the problem is solved to develop a recuperative pulse burner with a short overall length and with a burner stone insert and be designed such that it a uniform design of the casing the execution of burners with different benefits, the application of a recuperator with the technical parameters required dimensions if necessary, be changed quickly.

p0016The invention therefore relates to a recuperative pulse burner with uniformly trained housing, with a burner stone insert and with appropriate institutions for the gas and air supply and ignition; the pulse burner has a arranged at the rear end of the burner stone insert collectors for hot air and a hot air storage limiting air distributing chamber; before the air distributing chamber - this enclosing - arranged an exhaust manifold; at which the exhaust manifold facing part of the air-distributing chamber an additional heat exchange surface is provided, to which an inside and outside ribbed Rekuperatorelement with removable collar, is advantageous with a thread attached which is surrounding the burner stone insert sheet clothing conforms with Dilationsmöglichkeit; furthermore is an air distributing to the chamber with removable collar, advantageously connected with thread, the sheet covering rings arranged concentrically to provided inside the interior and exterior finned element exploiting Knitting, externally finned element.

p0017The invention is illustrated with reference to an advantageous embodiment with reference to the drawing. In the drawings:<ul><li>1 shows the cross section of the recuperative pulse burner with the burner stone insert, and</li><li>Figure 2 shows the cross-section of the burner block insert, exhaust and air passages.</li></ul>

p0018Gas passes through radial holes of a gas nozzle 1 in Bremm room 2. Cold air passes through an air supply port 3, an exhaust manifold 4 and an additional heat exchange surface 5 and a standing in the heat exchange air distributing chamber 6 to a countercurrent skying 7, after which they are reversing into a direct current skying 8 arrives. The pre-heated in this manner, air passes in an insulated hot air collectors 9 and flows through an air swirler unit 10 in the combustion chamber.

p0019The counterflow air passage 7 and an exhaust passage 11 are 12 separated by a Rekuperatorelement with removable collar, eg with a thread connected to the air distributing chamber 6, made of heat-resistant casting material, externally and internally ribbed, which, with its curved end to a heat-resistant sheet covering 14 of the burner stone insert is adapted. 13 The counterflow air passage 7 and the DC skying 8 are separated from one of the hot air collector 9 with removable collar, eg with a thread, connected, gefertigen of heat-resistant casting material, inside ribbed Rekuperatorelement 15, between the outside and inside ribbed Rekuperatorelement 12 and the sheet covering 14 the burner block insert is inserted. The burner stone insert 13 extends the full length of the interior and exterior ribbed Rekuperatorelementes 12 and the internally ribbed Rekuperatorelements 15th

p0020The burning of the fed through the radial bores of the gas nozzle gas will start after the ignition and flame detector 16 in the field generated by the air swirl unit 10 a cylinder jacket-like air flow, the principle of continuous Vermischungs combustion accordingly; as a result of the terminated at the end of the combustion chamber 2 firing process occurs the combustion product at high speed out into the working area of ​​the furnace. The exhaust gas leaving the furnace stömt through the exhaust passage 11 and releases the heat by radiation and convection to the outside and inside ribbed Rekuperatorelement 12 from. The inside and outside ribbed Rekuperatorelement 12 radiates a portion of the exhaust heat to the internally ribbed Rekuperatorelement 15. The exhaust gas - after the additional heat exchange surface was 5 heated by radiation and convection in the exhaust manifold 4 - passes through a suitably provided with ejector exhaust outlet 17 into the abgasableitende system from the furnace. The burner housing is determined by the expedient insulated hot air collectors 9, the air distributing chamber 6, the chamber arranged in front of this and unschließenden exhaust manifold 4 ge forms, whereby a short structural length is possible.

p0021The results from the application of the invention advantages are as follows:

p0022By suitably configured structure the maximum benefits at the burner are combined by the working at high speed pulse burner which characterized ges can be achieved icherte increased heat transfer and thermal efficiency of the exiting exhaust gases. In addition to the substantially reduced dimensions (about 40% on average) allowing uniform housing design and the use of the recuperator to the adaptive dimensions on the one hand the design of a burner with multiple power levels and the optimal utilization of heat even with changing technical parameters (falling temperature in the working area of the furnace ).