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首页> 外文期刊>Thermal engineering >Three-Zonal Engineering Method of Heat Calculation for Fluidized Bed Furnaces Based on Data on Commercial Investigations of Heat Generation Distribution during Biomass Combustion
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Three-Zonal Engineering Method of Heat Calculation for Fluidized Bed Furnaces Based on Data on Commercial Investigations of Heat Generation Distribution during Biomass Combustion

机译：基于生物质燃烧热分布商业调查数据的流化床炉热量计算的三区工程方法

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摘要

A three-zonal method of heat calculation of furnaces for combustion of biomass and low-caloric fuel in the fluidized bed is described. The method is based on equations of thermal and material balances that account for heat generation by fuel in the zone, heat-and-mass transfer heat exchange between the furnace media and surfaces that bound the zone, and heat-and-mass transfer between furnace zones. The calculation procedure for heat generation by fuel in the fluidized bed (FB) using the heat generation portion by the fuel is proposed. Based on commercial investigations, the main factors that affect the average temperature in the FB and the portion of fuel heat that is released in the FB are determined. Results of commercial investigations showed that the airflow coefficient in the FB should be recognized as the main operation parameter that affects the average temperature in the FB and, consequently, heat generation in the FB. The gas flow rate in the FB can be marked out as the second factor that affects the consumption degree of oxidizer supplied in the FB. Commercial investigations revealed that mixing is affected by the gas flow rate in the FB and the bed material particle size, which may be changed during the boiler operation because of the agglomeration of particles of sand and ash. The calculation processing of commercial investigations on a KM-75-40M boiler of a CHP-3 of an Arkhangelsk Pulp and Paper Mill (APPM), which was carried out using the inverse problem procedure by means of a developed computer program, determined the range of the fuel heat release share in the FB, which was 0.26-0.45 at an excess air factor of 0.59-0.93 in the bed, and the heat release share in the maximum temperature zone in the total heat release in the superbed space. The heat release share in the bed is determined as an approximating function of the excess air factor in the bed and the fluidization number. The research results can be used during designing boilers with the fluidized bed on biomass.
机译：描述了一种用于流化床中燃烧生物质和低热量燃料的熔炉热量的三区域方法。该方法基于热和材料平衡方程，这些方程解释了区域中燃料产生的热量，热质传递，炉膛介质与界定该区域的表面之间的热交换，以及熔炉之间的热质传递区域。提出了利用燃料产生热量的流化床（FB）中燃料产生热量的计算程序。基于商业调查，确定了影响FB中平均温度和FB中释放的部分燃料热量的主要因素。商业调查的结果表明，FB中的空气流量系数应被视为影响FB中平均温度并因此影响FB中热量产生的主要操作参数。可以将FB中的气体流速标记为影响FB中供应的氧化剂消耗程度的第二个因素。商业调查表明，混合受到FB中气体流速和床料颗粒尺寸的影响，在锅炉运行期间，由于沙子和灰烬颗粒的团聚，混合温度可能会发生变化。使用逆问题程序，通过开发的计算机程序，对阿尔汉格尔斯克制浆造纸厂（APPM）CHP-3的KM-75-40M锅炉的商业调查计算过程确定了范围FB中燃料的热量释放份额为0.26-0.45，床中过量空气系数为0.59-0.93，而超级床层总热量释放中最高温度区的热量释放份额。床中的热释放份额确定为床中过量空气系数和流化数的近似函数。该研究结果可用于设计生物质流化床锅炉。

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