• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Procedure for preheating an oxidant for use in the combustion of a fuel in a burner (3) (1), in an industrial furnace which furnace (1) is intended to heat a material (2). The invention is also characterized in that the oxidant in a first stage is used as a cooling medium for a cooling bed (8) of cooling material (9) which has previously been heated in an industrial furnace so that the oxidant is simultaneously heated, and also the oxidant in a final stage is brought to burn 3) and where it is used to burn the fuel. Application text document 2009-04-28 090069EN
    公开号:SE0950283A1
    申请号:SE0950283
    申请日:2009-04-28
    公开日:2010-10-29
    发明作者:Mats Gartz
    申请人:Linde Ag；
    IPC主号:
    专利说明:

    Figure 1 is a side view of a method according to a first preferred embodiment of the present invention; Figure 2 is a side view of a method according to a second preferred embodiment of the present invention; and Figure 3 is a side view of a method according to a third preferred embodiment of the present invention; Figure 1 illustrates an industrial furnace 1 in which a material 2, preferably a mesh material, is heated by means of heat from a burner 3. The material 2 can also be, for example, glass or other materials which are normally heated in industrial furnaces.
    The industrial furnace can be intended for continuous operation, whereby material 2 is passed through the furnace continuously, or for batch operation. The material 2 is preferably a steel material, in which case the oven temperature is typically between 100 and 1300 ° C. The purpose of the heating is to achieve a higher temperature of the material 2 before a subsequent processing step (not shown), such as forging, rolling or extrusion.
    The burner 3 can be an air burner, which is operated with a fuel in solid, liquid or gaseous form and air as oxidant.
    However. can the burner. 3 also operated with. an oxidant that contains more oxygen than is the case with air, for example oxygen-enriched air with at least 50% by weight of oxygen or industrial oxygen with a purity of at least 80% by weight of oxygen. The burner. 3 has a supply line 4 for fuel and a supply line 5 for oxidant.
    The present invention is particularly useful in the case where the burner 3 is operated with a sub-stoichiometric mixture of fuel and oxidant, so that an excess of fuel arises immediately outside the mouth of the burner 3, and when additional oxidant is supplied through a lance 6, arranged on distance from the burner 3. Through the lance 6 additional oxidant is supplied via a supply line 7. It is in this case preferred that the additional oxidant, which preferably contains at least 80, more preferably at least 95% by weight of oxygen, is supplied in such an amount that Lambda for on the one hand the oxidant which is supplied through the burner 3 and through the lance and on the other hand through the burner 3 fuel supplied is about 1 or slightly over 1.
    Downstream of the on1ignen 1 and the processing step there is a cooling bed 8, on which material 9 which has previously been heated in the oven 1 and processed has been allowed to cool.
    The heat energy present in the heated material 9 is low value. Traditionally, therefore, this has not been used to increase the efficiency of heating in the furnace 1. Rather, only the heat energy in the flue gases is often used for heat recovery. It is even common for the cooling bed 8 to be arranged outdoors, whereby the supplied heat energy in the material 9 is allowed to be transferred to the atmosphere. Attempts to harness the heat energy in cooling materials and use it in an industrial furnace have so far resulted in solutions that are too costly to install to be cost-effective.
    The present inventors have now surprisingly found that it is possible to utilize the low-value heat energy in the cooling material 9 by heat exchange between the material 9 and the oxidant which is then used to burn the fuel supplied through the burner 3.
    Application text doc 2009-0418 090069EN Thus, the oxidant is used in a first step as a cooling medium to cool the material 9 on the cooling bed 8, so that the oxidant is simultaneously heated, after which the oxidant is passed, via the supply line 5, to the burner 13 and used there to burn the fuel.
    This firstly achieves that the oxidant is preheated before combustion, which increases the efficiency of the furnace 1. Secondly, a faster cooling of the material 9 can be achieved in cases where this is desirable or possible, depending on the current conditions regarding material type and process.
    In order to efficiently utilize the heat energy of the material 9, the oxidant is heat exchanged in accordance with a preferred embodiment in that the cooling of the material 9 is convective and consists in allowing the oxidant to flow past the material 9 to be cooled. Such a heat exchange is especially useful in case the burner 3 is fed with air as oxidant, since the air intake 11 through which the burner 3 is supplied with air can then simply be moved to a place where the oxidant is taken from the cooling atmosphere 9 of the material 9, immediately adjacent to the material 9. This means that the air introduced through the air inlet 11 has already been heated by cooling the material 9. An existing industrial furnace plant can thus be very easily and cheaply modified in this way so that the oxidant supplied to the burner 3 is preheated.
    According to a preferred embodiment, a hood 10 is arranged above the cooling bed 8, in which hood 10 heated air is collected above the material 9, and in which hood 10 the air intake 11 is arranged.
    Through such an arrangement, air can be preheated from room temperature to approximately 150-200 ° C without the need for externally supplied heat energy. Such preheating in itself increases the efficiency of the furnace 1, but in order to further increase the efficiency, it is preferable to combine. such a preheating 'with. an additional preheating step 12, arranged before the oxidant reaches the burner 3. The additional preheating step 12 is preferably a per se conventional recuperator or equivalent. they leave, as. recovering heat energy from the flue gases furnace 1. illustrates a second Figure 2 preferred embodiment of the present invention, which is similar to the embodiment illustrated in Figure 1 and shares reference numerals for corresponding parts.
    Instead of the hood 10, the cooling material 9 on the cooling bed 8 is surrounded by a closed casing 20 through which the oxidant is brought is led from an inlet 22 to an outlet 21. Since the oxidant flowing through the casing 20 in this case is entirely the atmosphere in which the material 9 is cooled, the heat energy in the material 9 can be efficiently transferred to the oxidant via convection.
    In this case, the final temperature of the preheated oxidant may be higher than in the case of the hood 10 described above, but on the other hand. installation costs are higher.
    In some applications it may be preferable to combine even such a preheated oxidant with a higher temperature with an additional heating 12 of the oxidant as described above, although this is not always the case.
    Figure 3 illustrates a third preferred embodiment. of the present invention which is particularly preferred so that when the burner 3 preheats non-air oxidant, it is operated with oxygen-enriched air or industrial oxygen according to the above, or to preheat the additional oxidant supplied through the lance. 6. The third embodiment is also similar to the embodiment illustrated in Figure 1 and, like Figure 2, also parts reference numerals with Figure 1 for corresponding parts.
    In a closed casing 30 similar to the casing 20 illustrated in Figure 2, there are heat exchangers 31, 32, through which oxidant to be preheated is led without coming into direct contact with the cooling bed 8.
    The material 9 is cooled under a height 30 of the material 9 in a suitable atmosphere, such as for example air, inside. This atmosphere transfers heat mainly from the material 9 to the heat exchangers 3l, 32 by convection, whereby the material 9 is cooled at the same time as the heat exchangers 31, 32 led oxidant is preheated.
    Oxidant is supplied from oxidant sources 33, 34, which may be the same or different for oxidant to be fed to the burner 3 and to the lance 6.
    By allowing oxidant to pass in close proximity to the cooling material 9 without coming into direct contact therewith, the heat energy in the material 9 can be effectively used to preheat oxidant even if the oxidant is not air. For example, the oxidant may be harmful to the surface of the material 9, and can therefore not be allowed to come into direct contact with it.
    In particular, in this way, additional oxidant to be supplied through the lance 6 can be preheated, which increases the efficiency of the plant. Of course, it is also possible to preheat only oxidant to be supplied through the lance 6.
    Application text doc 2009-0418 090069EN By operating the burner 3 with a substoichiometric mixture of fuel and preheated oxidant, and at the same time adding additional oxidant through the lance 6, the efficiency of an existing plant can be significantly increased with relatively low installation costs. This applies in particular in the case where an existing air burner 3 is installed in an industrial furnace 1. By supplementing the existing air burner in this case. 3 med. a lance 6 for additional oxidant with a high oxygen content and at the same time drive the burner 3 with one and where the oxidant less amount of air, further and / or the air is preheated according to the present invention, the maximum power of the industrial furnace 1 can be significantly increased at low cost while its efficiency increased.
    Preferred embodiments have been described above. However, it will be apparent to those skilled in the art that many changes may be made to the described embodiments without departing from the spirit of the invention.
    For example, the furnace used to heat the material need not be the same furnace in which the preheated oxidant is used after being used as a cooling medium to cool the material.
    For example, in the case of several successive heating and processing steps, processed, cooling material can be used to preheat oxidant used in an oven arranged downstream of the cooling bed before a further subsequent processing step.
    Thus, the invention should not be limited by the described embodiments, but may be varied within the scope of the appended claims.
    Application text document 2009-0418 090069EN
    权利要求:
    Claims (11)
    [1]
    1. A method of preheating an oxidant for use in the combustion of a fuel in a burner (3) (1), characterized in an industrial furnace (2), in which a oxidant in a first stage which furnace (1) is arranged to heating a material is used as a cooling medium to cool on a cooling bed (8) material (9) previously heated in an industrial furnace so that the oxidant is simultaneously heated, and by the oxidant being passed to the burner (3) in a second step and there is used to burn the fuel. k ä n n e t e c k n a t a v
    [2]
    A process according to claim 1, that the oxidant is air.
    [3]
    3. A method according to claim 2, characterized in that the cooling of the material (9) in the first step is made to be convective and is carried out by allowing the oxidant to flow past the material (9) to be cooled. k ä n n e t e c k n a t (ll)
    [4]
    A method according to claim 3, a) that the air intake of the burner (3) is caused to be arranged in the cooling atmosphere of the material (9), in immediate connection with the material (9) to be cooled.
    [5]
    Method according to claim 1, characterized in that the oxidant is oxygen-enriched air, and in that the cooling of the material (9) in the first step is carried out by means of heat exchange, by allowing the oxidant to flow in close proximity to the material (9). to be cooled without coming into direct contact with the material (9).
    [6]
    A method according to any one of the preceding claims, characterized in that a hood (10) is caused to be arranged over the cooling bed (8) and by causing the oxidant to be passed through the hood (10). 10) past the material (9) to be cooled.
    [7]
    A method according to any one of the preceding claims, characterized in that the material (9) on the cooling bed (8) is caused to be surrounded by a closed casing (20; 30) through which the oxidant is led in the first step.
    [8]
    Process according to any one of the preceding claims, characterized in that the oxidant in the first step is caused to be heated from room temperature to between 150 and 200 ° C.
    [9]
    9. A method according to claim 8, characterized in that the oxidant in a further step after the first step but before the second step is caused to be further heated in a conventional manner to the desired temperature by means of a further preheating device (12).
    [10]
    10. A method according to any one of the preceding claims, k n n e e - t e c k n a t a v 'to the burner. (3) is also brought into operation. a sub-stoichiometric mixture of fuel and oxidant, and that additional oxidant in the form of at least 80% oxygen is supplied by a lance (6) arranged at a distance from the burner (3).
    [11]
    Method according to one of the preceding claims, in which the material (2; 9) is a metal material. by Application Text Doc 2009-0418 090069EN
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    同族专利:
    公开号 | 公开日
    SE534085C2|2011-04-26|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2013-12-03| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE0950283A|SE534085C2|2009-04-28|2009-04-28|Process for preheating an oxidant for use in an industrial furnace|SE0950283A| SE534085C2|2009-04-28|2009-04-28|Process for preheating an oxidant for use in an industrial furnace|
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