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  Burner nozzle field comprising integrated heat exchangersUSPTO Application #: 20070122756Title: Burner nozzle field comprising integrated heat exchangers Abstract: The invention relates to a novel burner nozzle field consisting of nozzle field modules which work with an intensive air pre-heating system and which produce gas impact spots on the material which is to be warmed, which have an average distance of, preferably, less than 150 mm and, in the best case, less than 100 mm. The burners work with a deignited gas outlet and an individual air pre-heating system. The individual nozzle field modules can work in any particular spatial orientation. Burner nozzle fields can be arranged behind each other in order to increase efficiency. (end of abstract) Agent: Ronald S. Lombard Patents And Trademarks - Murrysville, PA, US Inventors: Joachim A. Wunning, Joachim G. Wunning USPTO Applicaton #: 20070122756 - Class: 431011000 (USPTO) Related Patent Categories: Combustion, Process Of Combustion Or Burner Operation, Heating Feed The Patent Description & Claims data below is from USPTO Patent Application 20070122756. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This is a continuation-in-part application of international application PCT/EP2005/007985 filed Jul. 21, 2005 and claiming the priority of German application 10 2004 035 276.3 filed Jul. 21, 2004. BACKGROUND OF THE INVENTION [0002] The invention relates to a burner nozzle field comprising a plurality of nozzles, each provided with an air preheating structure (22) and each having at least one nozzle opening for directing a jet (32) of a mixture of fuel and heated air onto a target surface of a material to be heated by impact jet flames at a target spacing of less than 150 mm upon ignition of the fuel/air mixture in the jet (32). [0003] Burner nozzle fields which are used for heating industrial goods such as, for example, steel strips, steel rods, tubes or similar goods are generally called heated nozzle fields. They produce a relatively large number of impact jet flames disposed at small distances from one another that is in a tight pitch. By the combustion of a high convective heat transfer and a high temperature obtained with the combustion in the nozzle field, high heat flow densities of several hundred hole walls per square meter are obtained which substantially exceeds radiation heating capabilities. This effect is used in industry for the rapid heating of surfaces, particularly in the metal working industry, but also in other industrial areas. [0004] The main objects for optimizing the heated nozzle fields are: [0005] obtaining the highest possible heat flow density at the surface; [0006] providing for a highly uniform heat transfer particularly in connection with a thin-walled good, where a temperature compensation in the surface area is inhibited; and, [0007] providing for the highest possible efficiency. [0008] Particularly, the requirement of high heat flow density, that is a high specific performance is counter to the requirement of good uniformity and high efficiency. [0009] Particularly, the requirement for high heat flow density that is high specific performance in a certain way is contradictory to the requirement of high uniformity and high efficiency. [0010] It is, therefore, the object of the present invention to provide a high-performance burner nozzle field which has a high power output, a uniform heat transfer and high efficiency and which operates highly economically. SUMMARY OF THE INVENTION [0011] The invention relates to a novel burner nozzle field consisting of nozzle field modules which work with an intensive air pre-heating system and which produce gas impact spots on the material which is to be warmed, which have an average distance of, preferably, less than 150 mm and, in the best case, less than 100 mm. The burners work with a deignited gas outlet and an individual air pre-heating system. The individual nozzle field modules can work in any particular spatial orientation. Burner nozzle fields can be arranged behind each other in order to increase efficiency. [0012] In an accordance with this invention the burner nozzle field includes a plurality of nozzles, each with an air heating structure which is formed by regeneration or a recuperation arrangement for individually heating the air supplied to the individual nozzles up to over 500.degree. C. in order to increase not only the efficiency, but also the heat transfer as, with the pre-heating of the air the volume flow increases. [0013] The nozzles are arranged in spaced relationship at a distance from one another which is less than 200 mm. Preferably the lateral distance is less than 150 mm. Ideally, it does not exceed 100 mm. With this tight spacing a highly uniform heat transfer is achieved. Furthermore, the nozzle openings are oriented essentially axially. If several nozzle openings are present, they define, for example, a narrow cone, wherein the discharge directions of the nozzle openings of adjacent nozzles are oriented relative to one another in such a way that the impact areas of all jets on the goods to be heated form an equidistant pattern. If a nozzle has, for example, four individual nozzle openings, the pitch spacing of the impact center points on the good to be heated is half the spacing defined by this lateral distance between the nozzles. The angle formed between the individual nozzle jets and the longitudinal axis of the nozzle body is preferably less than 45.degree.. Preferably it is only 30.degree. (corresponding to a cone angle of 60.degree.). This can be achieved by arranging the nozzle openings in a circle evenly spaced on a cylindrical nozzle body with curved end face. With this steep impact angle on one hand, a good heat transfer and, on the other hand, a uniform flow pattern with large-volume recirculation in the available reaction or, respectively re-circulation space can be obtained. The large-volume recirculation increases on one hand the mass flow of the hot gas impacting the goods to be heated and, on the other hand, facilitates the formation of a flameless oxidation. This, again, prevents the formation of local temperature peaks and, consequently, enhances a uniform heating of the goods to be heated. The uniform heating is further enhanced by the pre-heating of the air to temperatures of over 500.degree. C. and by a nozzle design which causes the fuel/air mixture jet to leave the nozzle in an unburned state, that is, at the point of leaving the nozzles, the fuel and air are still present as such and have essentially not yet reacted with each other. [0014] The heat transfer is mainly caused by the impact of the hot gas jets, that is the "parallel jets" on the goods to be heated (forced convection). With the high flow speed of at least 50 m/s and even better 100 m/s the gas jets impacting the goods to be heated transfer a very large amount of heat to the goods to be heated. This heat transfer is substantially higher than a heat transfer obtainable by radiation at the same burner temperature. In addition the heat transfer is independent of the reflection properties of the goods to be heated. It does essentially not matter whether the goods to be heated are metallic, shiny or black (for example by scale). To obtain the same heat transfer by radiation a substantially higher burner temperature would be required with the known inherent disadvantages regarding NO.sub.x generation. Furthermore, with such high radiation heat outputs, radiation heating is critical with regard to the transport speed of the goods to be heated. If the goods stop or move too slowly, it can easily be overheated. This is not a danger with parallel jet heating. In addition, with the large reaction chambers, a large-area recirculation and a flameless oxidation with low formation of contaminants are facilitated. [0015] The nozzle body and the air preheating arrangement (regenerator or recuperator) are preferably combined in a burner, that is a design unit, wherein several such burners jointly form a nozzle field module. The nozzle field module has a common air supply and a common exhaust gas discharge for example in the form of an exhaust gas collection box. With this proposed design combination of several burners in a burner module, the small pitch, that is the tight spacing between the burners is facilitated. [0016] Preferably in the burner module, the burners are arranged so that they extend at a right angle from the air and exhaust gas guide structure. They therefore extend through a corresponding wall provided with openings. By the combination of the burners in a module, the desired tight pitch is achieved. [0017] The nozzle bodies extend beyond the combustion chamber wall so that the nozzle openings are disposed at a distance from the combustion chamber wall. The nozzle openings of the nozzle bodies are preferably disposed at a distance of at least 50 mm, preferably at least 100 mm from the combustion chamber wall. As a result a reaction volume is formed between the individual nozzle bodies which can accommodate a large-volume examination. In this way, the residence time of the gases in the combustion chamber can be increased particularly in view of the desired small distances between the nozzle openings and the goods to be heated. These distances are preferably below 200 mm. Preferably they are below 150 mm and optimally below 100 mm. The recirculation volume required with such small distances between the nozzle opening and the goods to be heated which facilitates particularly a flameless oxidation is generated by the extension of the nozzle bodies beyond the combustion chamber wall. [0018] Each nozzle body includes one, preferably several, nozzle openings whose discharge directions define a narrow cone. This cone is so narrow that the nozzle jets impact the surfaces of the goods almost at a right angle. [0019] For an increase of this mass flow and, consequently, a more homogenous heat input, exhaust gas can be added to the fuel air mixture. Furthermore, the burner nozzle field may be operated with excess air, stoichiometrically or under-stoichiometrically. [0020] Furthermore, the burner nozzle field may be arranged above, as well as, below the goods to be heated. If the goods to be heated have a large flat surface area, such as metal sheets, it is possible to transport them floating on a gas cushion build up by the burner nozzle field. [0021] Furthermore, the goods to be heated by burner nozzle fields are heated at the same time from both sides. Consequently the burner nozzle field according to the invention provides for rapid heating of the goods to be heated. Preferably, the individual nozzles are arranged in rows which are oriented, that is, inclined with respect to the transport direction of the material to be heated. In this way the formation of heat strips is prevented. [0022] The invention will become more readily apparent from the following description of particular embodiments thereof on the basis of the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS [0023] FIG. 1 shows a burner nozzle field with a work piece in a longitudinal cross-sectional view. [0024] FIG. 2 shows the burner nozzle field of FIG. 1 in a transverse cross-sectional view. Continue reading... Full patent description for Burner nozzle field comprising integrated heat exchangers Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Burner nozzle field comprising integrated heat exchangers patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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