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    • 5. 发明申请
    • REDUCING HEAT TRANSFER SURFACE AREA REQUIREMENTS OF DIRECT FIRED HEATERS WITHOUT DECREASING RUN LENGTH
    • 直接燃烧加热器的换热表面面积要求不减少运行长度
    • US20080173261A1
    • 2008-07-24
    • US11656033
    • 2007-01-22
    • Alan Cross
    • Alan Cross
    • F22B7/04
    • F22B21/345C10G9/20
    • This invention relates to the design of direct fired heaters which consist of vertically oriented refractory lined enclosures containing tubular heat transfer elements, the elements partially surrounding a cluster of burners. The burners fire gaseous fuel and generate high temperature combustion products which allow for the transfer of heat , by radiation and convection, from the combustion products to the heat transfer elements and the continuous flow of process fluid contained therein. The transferred heat raises the temperature of the fluid from the design temperature at the inlet to the design temperature at the outlet, at a heat transfer rate commensurate with the temperature differential existing at any given location. The surface area requirements of the heat transfer elements and that of the enclosure surrounding the heat transfer elements is significantly reduced by limiting top to bottom recirculation of burner generated combustion products, thereby increasing overall temperature differentials and heat transfer rates between combustion products and process fluid. Gains in heating surface reduction are not accompanied by losses in heater run length because low process fluid temperatures and high inside heat transfer coefficients are provided, which minimize process fluid film temperature in areas where high heat transfer rates prevail.
    • 本发明涉及直接燃烧加热器的设计,其由垂直取向的含有管状传热元件的耐火材料衬里的外壳组成,该元件部分地围绕燃烧器簇。 燃烧器燃烧气体燃料并产生高温燃烧产物,其允许通过辐射和对流从燃烧产物传递到传热元件的热​​量以及其中所含的工艺流体的连续流动。 转移的热量将流体的温度从出口处的设计温度升高到出口处的设计温度,其传热速率与任何给定位置处存在的温度差相当。 通过限制燃烧器产生的燃烧产物的顶部至底部再循环,传热元件和围绕传热元件的外壳的表面积要求显着降低,从而增加燃烧产物和过程流体之间的总温差和传热速率。 由于提供了低加工流体温度和较高的内部传热系数,因此加热表面减少的增益不会伴随加热器运行长度的损失,从而使传热率高的区域的工艺流体膜温度最小化。
    • 6. 发明授权
    • Reducing heat transfer surface area requirements of direct fired heaters without decreasing run length
    • 直接燃烧加热器的传热面积要求降低,而不会减少行程长度
    • US07395785B1
    • 2008-07-08
    • US11656033
    • 2007-01-22
    • Alan Cross
    • Alan Cross
    • F22B7/04
    • F22B21/345C10G9/20
    • This invention relates to the design of direct fired heaters which consist of vertically oriented refractory lined enclosures containing tubular heat transfer elements, the elements partially surrounding a cluster of burners. The burners fire gaseous fuel and generate high temperature combustion products which allow for the transfer of heat, by radiation and convection, from the combustion products to the heat transfer elements and the continuous flow of process fluid contained therein. The transferred heat raises the temperature of the fluid from the design temperature at the inlet to the design temperature at the outlet, at a heat transfer rate commensurate with the temperature differential existing at any given location. The surface area requirements of the heat transfer elements and that of the enclosure surrounding the heat transfer elements is significantly reduced by limiting firebox recirculation of burner generated combustion products, thereby increasing overall temperature differentials and heat transfer rates between combustion products and process fluid. Gains in heating surface reduction are not accompanied by losses in heater run length because low process fluid temperatures and high inside heat transfer coefficients are provided, which minimize process fluid film temperature in areas where high heat transfer rates prevail.
    • 本发明涉及直接燃烧加热器的设计,其由垂直取向的含有管状传热元件的耐火材料衬里的外壳组成,该元件部分地围绕燃烧器簇。 燃烧器燃烧气体燃料并产生高温燃烧产物,其允许通过辐射和对流从燃烧产物传递到传热元件的热​​量以及其中所含的工艺流体的连续流动。 转移的热量将流体的温度从出口处的设计温度升高到出口处的设计温度,其传热速率与任何给定位置处存在的温度差相当。 通过限制燃烧器产生的燃烧产物的燃烧箱再循环,从而显着降低了传热元件和围绕传热元件的外壳的表面积要求,从而提高了燃烧产物和过程流体之间的总温差和传热速率。 由于提供了低加工流体温度和较高的内部传热系数,因此加热表面减少的增益不会伴随加热器运行长度的损失,从而使传热率高的区域的工艺流体膜温度最小化。