2250热轧板厂常规/蓄热式加热炉热平衡对比分析

通过对2250热轧加热炉进行热平衡测试和分析,对比了常规加热炉和蓄热式加热炉的热效率等关键参数。根据热平衡计算结果,寻找了炉子之间存在的燃耗差异,分析产生这些差异的主要原因,并根据分析结果提出了相应的改进措施,为降低加热炉能耗和钢铁轧制成本提供了技术指导方向。     

炼油加热炉热效率测试计算分析

针对炼油加热炉在实际运行中存在热效率低的问题,通过对加热炉现场全面测试,同时利用焓差法对余热回收系统的热平衡进行计算,分析了加热炉热效率低的主要原因,并提出了解决措施和建议。     

轧钢加热炉热平衡测试分析

文中通过对某厂热带加热炉进行热工测试、热平衡计算及结果分析,由此了解加热炉能源利用状况,查找加热炉设计、施工及使用过程中能源利用方面存在的不足,达到用能设备节能的目的。     

钛合金锻造用电阻加热炉的热平衡测试与分析

给出了钛合金锻造用电阻加热炉的热平衡测试方法,对两台电阻加热炉进行了热平衡测试和数据分析,结果发现产品单耗是影响热效率的主要因素,并对产生热损失的诸多因素进行讨论,提出了改进意见。     

不同供热方案下加热炉节能效果的对比分析

以实际生产步进梁式加热炉为例,通过详细的热平衡计算,对比分析了不同煤气热值及供热方式下加热炉的节能效果,为炉子设计选择合理的供热方案提供参考,以节约燃耗和提高炉子热效率。     

工业燃气炉热平衡方法的探讨

本文着重讨论了工业燃气加热炉热平衡测试中的体系划分及测试计算方法，并针对某些不具备测试手段的情况提出了比较科学实际的解决方法。     

通过能量平衡分析,探讨加热炉节能途径

通过热平衡和（火用）平衡计算,对连续加热炉进行综合热工分析,针对炉子用能的薄弱环节,提出利用局部增氧和高温空气燃烧等技术措施实现加热炉节能的新的思路.     

工业炉气炉热平衡方法的探讨

本文着重讨论了戒严燃气加热炉热平衡测试中的体系划分及测试计算方法，并针对某些不具备测试手段的情况提出了比较科学实际的解决方法。     

电站热力系统汽水流量分配计算的研究

以常规热平衡方法为基础,将等效热降法应用于电站热力系统汽水流量的分配计算,计算结果与常规热平衡方法完全相同,并可简捷快速地计算出热力系统连接方式及局部参数变化对汽水流量分配的影响,为电站热力系统应用热力学第二定律进行定量分析奠定了基础。     

加热炉脉冲燃烧工况下热平衡测试与分析

通过对脉冲和比例燃烧工况下步进式加热炉进行热平衡测试与计算,结果表明脉冲燃烧可以节约燃料、降低氧化烧损率.分析了脉冲燃烧在热工操作过程中存在的问题,并提出改进意见,为改善生产提供理论依据.     

基于热平衡原理的硬质合金压力烧结炉最佳加热功率的研究

通过对硬质合金压力烧结炉的实际测试,根据系统热平衡原理,建立了硬质合金压力烧结炉的加热功率计算模型.理论和实践表明,加热功率存在最佳值,该值取决于炉子烧结产品的类型和烧结工艺.此外,对此类炉子的优化设计和最佳加热功率的确定等提出了合理化建议.所做工作对同类炉子的设计有重要的参考价值.     

等离子体技术在多晶硅还原炉的应用

针对内蒙多晶硅项目,在等离子体发生器对还原炉内部进行加热的条件下,对炉内温度场进行了试验测试,同时采用FLUENT软件对其进行了数值模拟。理论和计算的综合结果表明,等离子体加热技术在多晶硅还原炉中有着良好的加热应用效果。与同类型加热设备卤素灯相比,等离子发生器不仅加热效率高且运行成本相对较低,具有良好的应用前景。     

Novel Approach to Estimate the Optimum Zone Fuel Mass Flow Rates for a Walking Beam Type Reheating Furnace

Three-dimensional numerical simulation is performed to predict the heat transfer performance in a walking-beam reheating furnace. The furnace uses a mixture of coke oven gas as a heat source to reheat the slabs. The fuel is injected into the furnace at four zones: preheating zone, first heating zone, second heating zone, and soaking zone. This numerical model considers turbulent reactive flow coupled with radiative heat transfer in the furnace; meanwhile, the conductive heat transfer dominates the energy balance inside the slabs. An initial iterative method is proposed to estimate the fuel mass flow rate at each zone of the reheating furnace, while the required heating curve of the slabs is specified. In addition, a simplified two-dimensional numerical model is performed to estimate the fuel mass flow rate for the consideration of computational time consummation. The results of the two-dimensional numerical simulations are compared with those of three-dimensional numerical simulation and the in situ data. Furthermore, velocity and temperature distributions are examined for two cases under different heating curves of the slabs.     

链条炉排加煤粉复合燃烧锅炉炉膛传热计算基本方程

推导了链条炉排加煤粉复合燃烧锅炉炉膛的物擀平衡方程和上下炉膛的烟气热平衡方程，方程中考虑了上下炉膛间的辐射换热。用直接计算辐射换热量的方法，推导了炉膛的辐射换热方程，这些方程联立求解，可进行该类型锅炉炉膛的传热计算。     

采用辐射管加热的辊底式热处理炉数值仿真及其分析

以某公司拟建的采用辐射管加热的辊底式热处理炉为研究对象,在详细分析其传热机理的基础上,建立了炉内钢坯加热过程的二维传热数学模型.采用交替隐式格式的TDMA数值计算方法,开发出了采用辐射管加热的辊底式热处理炉钢坯加热过程二维传热模型计算机数值仿真系统,并进行了大量的数值仿真计算.所得结论为该公司即将开展的辊底式热处理炉模型优化控制奠定了坚实的理论基础.     

双燃料煤粉流化床复合燃烧锅炉的物质平衡与热量平衡

本文分析了双燃料粉流化床复事燃烧锅炉的物质平衡及热量平衡,得到了炉腔及空气预热器的物质平衡方程,沸腾层及煤粉炉膛的热平衡方程主炉膛出口过量空气系数,锅炉气体及未完全热损失,固体未完全损失的计算公式。     

Heat pump system utilizing produced water in oil fields

As the alternative to the heating furnace for crude oil heating, a heat pump system utilizing produced water, a main byproduct, in oil fields was proposed and the thermodynamic model of the system was established. A particular compression process with inner evaporative spray water cooling was applied in the screw compressor and an analysis method for the variable-mass compression process was introduced. The simulation results showed that the efficiency of the screw compressor, the temperature of produced water and the temperature difference in flash process are key parameters affecting the system performance. The energy cost of the heat pump system was compared to that of the heating furnace, revealing that the heat pump system with EER, 4.67, would save over 20% energy cost as compared with the heating furnace. Thus, the heat pump system was energy saving, money saving and environmentally benign.     

Radiative slab heating analysis for various fuel gas compositions in an axial-fired reheating furnace

A transient radiative slab heating analysis was performed to investigate the effect of various fuel mixtures on the performance of an axial-fired reheating furnace. The various fuel mixtures tested were assumed to be attained by mixing COG (coke oven gas) and BFG (blast furnace gas), which are the two main byproduct gases found in the integrated steel mill industry. The numerical prediction of radiative heat transfer was calculated using an FVM radiation solving method, which is a well-known and efficient method for curvilinear coordinates. The WSGGM (weighted sum of gray gas model) was also adopted to calculate the radiative heat transfer in composition dependent media. The entire furnace was divided into fourteen sub-zones to calculate the radiative thermal characteristics of the furnace without flow field calculations. Each sub-zone was assumed to have homogeneous media and wall temperatures. All of the medium and wall temperatures were computed by calculating the overall heat balance using some relevant assumptions. The overall heat balance was satisfied when the net heat input equaled the three sources of heat loss in each sub-zone, wall loss, skid loss, and slab heating loss.     

Efficiency analysis of radiative slab heating in a walking-beam-type reheating furnace

The thermal efficiency of a reheating furnace was predicted by considering radiative heat transfer to the slabs and the furnace wall. The entire furnace was divided into fourteen sub-zones, and each sub-zone was assumed to be homogeneous in temperature distribution with one medium temperature and wall temperature, which were computed on the basis of the overall heat balance for all of the sub-zones. The thermal energy inflow, thermal energy outflow, heat generation by fuel combustion, heat loss by the skid system, and heat loss by radiation through the boundary of each sub-zone were considered to give the two temperatures of each sub-zone. The radiative heat transfer was solved by the FVM radiation method, and a blocked-off procedure was applied to the treatment of the slabs. The temperature field of a slab was calculated by solving the transient heat conduction equation with the boundary condition of impinging radiation heat flux from the hot combustion gas and furnace wall. Additionally, the slab heating characteristics and thermal behavior of the furnace were analyzed for various fuel feed conditions.     

300MW循环流化床锅炉屏式受热面传热系数计算及其变化规律

根据300MW循环流化床（CFB）锅炉现场测试数据并结合以往CFB锅炉传热系数的研究成果,建立了屏式受热面烟气侧的传热模型,包括辐射传热模型和对流传热半经验公式．利用该模型对某300MWCFB锅炉在94％锅炉最大连续蒸发量（BMCR）工况下炉膛内屏式受热面的传热系数进行了计算,分析了屏式受热面管间节距、炉膛温度、工质温度、壁面黑度及烟气速度等因素对传热系数的影响．结果表明：烟气速度、炉膛温度和壁面黑度对传热系数的影响较大,所建立的传热模型能够合理地反映主要因素对CFB锅炉屏式受热面传热的影响．